Russia launches third day of Syria strikes from Iran

image of Russian plane bombing Syria

MOSCOW (Reuters) – Russian bombers launched a third day of air strikes against militants in Syria from an Iranian air base, the Russian defense ministry said on Thursday.

The ministry said Tu-22M3 long-range bombers and Su-34 fighter bombers struck Islamic State targets in the Syrian province of Deir al-Zor.

It said the military aircraft had taken off from bases in both Russia and Iran and destroyed six command posts and a large number of fighters and military equipment.

All the Russian planes returned to base after the strikes, the defense ministry said.

(Reporting by Alexander Winning; Editing by Maria Kiselyova)

Russia, spurning U.S. censure, launches second day of Syria strikes from Iran

Russian plane

By Alexander Winning and Andrew Osborn

MOSCOW (Reuters) – Russia launched a second day of air strikes against Syrian militants from an Iranian air base, rejecting U.S. suggestions its co-operation with Tehran might violate a U.N. resolution as illogical and factually incorrect.

State Department spokesman Mark Toner on Tuesday called the Iranian deployment “unfortunate,” saying the United States was looking into whether the move violated U.N. Security Council resolution 2231, which prohibits the supply, sale and transfer of combat aircraft to Iran.

Russia bristled at those comments on Wednesday after announcing that Russian SU-34 fighter bombers flying from Iran’s Hamadan air base had for a second day struck Islamic State targets in Syria’s Deir al-Zor province, destroying two command posts and killing more than 150 militants.

“It’s not our practice to give advice to the leadership of the U.S. State Department,” Major-General Igor Konashenkov said in a statement.

“But it’s hard to refrain from recommending individual State Department representatives check their own logic and knowledge of basic documents covering international law.”

Moscow first used Iran as a base from which to launch air strikes in Syria on Tuesday, deepening its involvement in the five-year-old Syrian civil war and angering the United States.

Russia’s use of the Iranian air base comes amid intense fighting for the Syrian city of Aleppo, where rebels are battling Syrian government forces backed by the Russian military, and as Moscow and Washington are working toward a deal on Syria that could see them cooperate more closely.

Russia backs Syrian President Bashar al-Assad, while the United States believes the Syrian leader must step down and is supporting rebel groups that are fighting to unseat him.

Russian Foreign Minister Sergei Lavrov said on Wednesday any U.S. dismay over Moscow’s military co-operation with Iran should not distract from efforts to realize the U.S.-Russia deal on coordinating action in Syria and securing a ceasefire.

Lavrov said there were no grounds to suggest Russia’s actions had violated the U.N. resolution, saying Moscow was not supplying Iran with military aircraft for its own internal use, something the document prohibits.

“These aircraft are being used by Russia’s air force with Iran’s agreement as a part of an anti-terrorist operation at the request of Syria’s leadership,” Lavrov told a Moscow news conference, after holding talks with Murray McCully, New Zealand’s foreign minister.

A graphic illustrating which targets Russia has so far struck from Iran can be seen here: http://tmsnrt.rs/2b458P3

(Additional reporting by Denis Pinchuk; Editing by Janet Lawrence)

Russia uses Iran as base to bomb Syrian militants for first time

A still image, taken from video footage and released by Russia's Defence Ministry on August 16, 2016, shows a Russian Tupolev Tu-22M3 long-range bomber based in Iran dropping off bombs at an unknown location in Syria. Ministry of Defence of the Russian Federation/

By Andrew Osborn

MOSCOW (Reuters) – Russia used Iran as a base from which to launch air strikes against Syrian militants for the first time on Tuesday, widening its air campaign in Syria and deepening its involvement in the Middle East.

In a move underscoring Moscow’s increasingly close ties with Tehran, long-range Russian Tupolev-22M3 bombers and Sukhoi-34 fighter bombers used Iran’s Hamadan air base to strike a range of targets in Syria.

It was the first time Russia has used the territory of another nation, apart from Syria itself, to launch such strikes since the Kremlin launched a bombing campaign to support Syrian President Bashar al-Assad in September last year.

It was also thought to be the first time that Iran has allowed a foreign power to use its territory for military operations since the 1979 Islamic revolution.

The Iranian deployment will boost Russia’s image as a central player in the Middle East and allow the Russian air force to cut flight times and increase bombing payloads.

The head of Iran’s National Security Council was quoted by state news agency IRNA as saying Tehran and Moscow were now sharing facilities to fight against terrorism, calling their cooperation strategic.

Both countries back Assad, and Russia, after a delay, has supplied Iran with its S-300 missile air defense system, evidence of a growing partnership between the pair that has helped turn the tide in Syria’s civil war and is testing U.S. influence in the Middle East.

Relations between Tehran and Moscow have grown warmer since Iran reached agreement last year with global powers to curb its nuclear program in return for the lifting of U.N., EU and U.S. financial sanctions.

President Vladimir Putin visited in November and the two countries regularly discuss military planning for Syria, where Iran has provided ground forces that work with local allies while Russia provides air power.

TARGET: ALEPPO

The Russian Defence Ministry said its bombers had taken off on Tuesday from the Hamadan air base in north-west Iran. To reach Syria, they would have had to use the air space of another neighboring country, probably Iraq.

The ministry said Tuesday’s strikes had targeted Islamic State as well as militants previously known as the Nusra Front in the Aleppo, Idlib and Deir al Zour provinces. It said its Iranian-based bombers had been escorted by fighter jets based at Russia’s Hmeymim air base in Syria’s Latakia Province.

“As a result of the strikes five large arms depots were destroyed … a militant training camp … three command and control points … and a significant number of militants,” the ministry said in a statement.

The destroyed facilities had all been used to support militants in the Aleppo area, it said, where battle for control of the divided city, which had some 2 million people before the war, has intensified in recent weeks.

The Syrian Observatory for Human Rights, a U.K.-based war monitor, said heavy air strikes on Tuesday had hit many targets in and around Aleppo and elsewhere in Syria, killing dozens.

Strikes in the Tariq al-Bab and al-Sakhour districts of northeast Aleppo had killed around 20 people, while air raids in a corridor rebels opened this month into opposition-held eastern parts of the city had killed another nine, the observatory said.

The Russian Defence Ministry says it takes great care to avoid civilian casualties in its air strikes.

Zakaria Malahifi, political officer of an Aleppo-based rebel group, Fastaqim, said he could not confirm if the newly deployed Russian bombers were in use, but said air strikes on Aleppo had intensified in recent days.

“It is much heavier,” he told Reuters. “There is no weapon they have not dropped on Aleppo – cluster bombs, phosphorus bombs, and so on.”

Aleppo, Syria’s largest city before the war, is divided into rebel and government-held zones. The government aims to capture full control of it, which would be its biggest victory of the five year conflict.

Hundreds of thousands of civilians are believed to be trapped in rebel areas, facing potential siege if the government closes off the corridor linking it with the outside.

Russian media reported on Tuesday that Russia had also requested and received permission to use Iran and Iraq as a route to fire cruise missiles from its Caspian Sea fleet into Syria, as it has done in the past.

Russia has built up its naval presence in the eastern Mediterranean and the Caspian as part of what it says are planned military exercises.

Russia’s state-backed Rossiya 24 channel earlier on Tuesday broadcast uncaptioned images of at least three Russian Tupolev-22M3 bombers and a Russian military transport plane inside Iran.

The channel said the Iranian deployment would allow the Russian air force to cut flight times by 60 percent. The Tupolev-22M3 bombers, which before Tuesday had conducted strikes on Syria from their home bases in southern Russia, were too large to be accommodated at Russia’s own air base inside Syria, Russian media reported.

(Additional reporting by Polina Devitt, Bozorgmehr Sharafedin, Angus McDowall and Thomas Perry; Editing by Peter Graff)

Russia says close to starting joint military action with USA in Aleppo

Russian Defence Minister Sergei Shoigu chairs a meeting on Syria at the Defence Ministry in Moscow

MOSCOW (Reuters) – Russia and the United States are close to starting joint military action against militants in the Syrian city of Aleppo, the RIA news agency on Monday cited Russian Defence Minister Sergei Shoigu as saying.

“We are now in a very active phase of negotiations with our American colleagues,” Shoigu was cited as saying.

“We are moving step by step closer to a plan – and I’m only talking about Aleppo here – that would really allow us to start fighting together to bring peace so that people can return to their homes in this troubled land.”

(Reporting by Lidia Kelly; Editing by Andrew Osborn)

Russia deploys advanced S-400 air missile system to Crimea

Russian President Vladimir Putin attends a news conference with Turkish President Tayyip Erdogan (not seen) following their meeting in St. Petersburg, Russia,

MOSCOW (Reuters) – Russia has deployed its advanced S-400 air defense missile system to annexed Crimea, Russian news agencies reported on Friday, citing a statement from the Russian Defence Ministry.

The announcement comes two days after President Vladimir Putin promised to take counter-measures after what he said were clashes between Russian forces and Ukrainian saboteurs in northern Crimea.

Ukraine denies the clashes took place. Russia annexed Crimea from Ukraine in 2014.

(Reporting by Polina Devitt; Writing by Maria Tsvetkova; Editing by Andrew Osborn)

Russia announces war games after accusing Ukraine of terrorist plot

Russian President Putin chairs meeting with members of Security Council to discuss additional security measures for Crimea after clashes on

By Andrew Osborn

MOSCOW (Reuters) – Vladimir Putin summoned his security council and the Russian Navy announced war games in the Black Sea, a day after the Russian president accused Ukraine of trying to provoke a conflict over Crimea, which Moscow seized and annexed in 2014.

The belligerent posture heightened worries in Ukraine that Russia may plan to ramp up fighting in a war between Kiev and pro-Russian eastern separatists that had been de-escalated by a shaky peace process.

Using some of his most aggressive rhetoric against Kiev since the height of the war two years ago, Putin has pledged to take counter-measures against Ukraine, which he accused of sending saboteurs into Crimea to carry out terrorist acts.

Ukraine has called the accusations false and says they look like a pretext for Russia to escalate hostilities. Such an escalation could be used by Putin to demand better terms in the Ukraine peace process, or to inflame nationalist passions at home ahead of Russian parliamentary elections next month.

The Russian leader met his top military and intelligence service brass on Thursday and reviewed “scenarios for counter-terrorism security measures along the land border, offshore and in Crimean air space,” the Kremlin said.

Ukrainian President Petro Poroshenko said he had ordered all Ukrainian units near Crimea and in eastern Ukraine onto the highest state of combat readiness. He was seeking to urgently speak to Putin, the leaders of France and Germany, U.S. Vice President Joe Biden and European Council President Donald Tusk.

Oleh Slobodyan, a spokesman for the Ukrainian border guards, said Russia had massed troops on Ukraine’s border with Crimea in recent days following an uptick in Russian military activity in northern Crimea and heavier fighting in eastern Ukraine.

“These troops are coming with more modern equipment and there are air assault units,” he told a news briefing in Kiev.

The Russian Defence Ministry said its navy – whose Black Sea Fleet is based in Crimea – would start to hold exercises in the area to practice repelling underwater attacks by saboteurs.

PUTIN’S PLAY

Russia says it caught the infiltrators after at least two armed clashes on the border between Crimea and Ukraine over the weekend, and one of its soldiers and an FSB security service employee were killed. Kiev denies the events ever happened.

Whatever the truth, the allegations have already scuppered planned talks about eastern Ukraine slated for the sidelines of a G20 summit in China next month. Putin said such talks would now be “pointless.”

In an editorial, the Russian newspaper Vedomosti said escalation was a proven Kremlin tactic ahead of negotiations. Putin was trying either to alter or to tear up the Minsk peace process, named for the Belarus capital where truces were hammered out for the war in eastern Ukraine’s Donbass region.

“Events in Donbass in 2014-15 showed that the Kremlin tactic is to raise the stakes before negotiations. The main political question now is what will happen to the Minsk process. Will Russia break away from it or will it demand new concessions?” the newspaper wrote.

“Putin in his rhetoric has returned to the start of 2014. Once again, he does not deem the Ukrainian authorities legitimate.”

Volodymyr Fesenko, a political analyst in Ukraine, said he thought the Kremlin had its own revised peace plan for eastern Ukraine up its sleeve.

“Putin will scare the West with the prospect of full-scale conflict with Ukraine,” he said. “He is trying to increase pressure on Kiev to force Ukraine to accept a Russian plan to resolve the conflict in the east.

“Putin won’t go all out for a big war. But there might be pinpoint military operations against radicals whose bases are located near the border with Crimea.”

PUTIN’S AIMS

The European Union and the United States have tied the success of talks under the Minsk process to any possible decision to lift financial sanctions imposed on Russia over the Ukraine crisis.

But Moscow has grown increasingly frustrated by the talks and by what it says is Ukraine’s refusal to fulfill the terms of the truce. Kiev for its part says Moscow is the one that is still stirring tensions among pro-Russian separatists.

Escalating tension over Crimea could give Putin a pretext to abandon talks altogether, or demand changes to their format and terms, while holding out the prospect of a full-scale renewal of hostilities if he doesn’t get what he wants.

It could also help rally Russians ahead of the parliamentary vote, in which the main pro-Kremlin United Russia Party might struggle to win as many votes as usual because of an economic slump caused by low oil prices as well as the sanctions.

“While polls show United Russia doing okay (60 percent support), Putin never likes to take chances with domestic politics,” Timothy Ash, a strategist at Nomura Bank, wrote in a note. “(He) will want to impress on the Russian electorate his own strength and how lucky they are to be Russian citizens as perhaps compared to their Ukrainian counterparts.”

The imbroglio also gives Crimea’s pro-Russian authorities an excuse for their failure to raise living standards since Russia took over. Sergei Aksyonov, the Russian-backed prime minister, told state TV he blamed the Ukrainian incursions on the U.S. State Department.

Putin may also hope instability in Ukraine can feed into the U.S. presidential election campaign, where Republican Donald Trump accuses President Barack Obama’s administration of incompetence and has called for better ties with Moscow. Putin may yet hope to cut a deal on both Ukraine and Syria, the two big issues of contention with Washington, before Obama exits.

What actually happened in and around Crimea at the weekend remains disputed. U.S. ambassador to Ukraine Geoffrey Pyatt said Washington had so far seen nothing to corroborate Russia’s version. A spokeswoman for EU foreign affairs chief Federica Mogherini also said there had been no independent confirmation.

Russia’s Kommersant newspaper on Thursday cited unnamed security sources as saying a group of men Russia had arrested for planning attacks had confessed to seeking to destroy Crimea’s tourist industry by bombing resorts.

The sources told Kommersant two of seven saboteurs in one group had been killed and five captured. Most were Crimea residents and some had Russian passports, they said.

In Ukraine, the brother of one of the detained men said he thought his brother had been kidnapped as part of “a big game.”

(Additonal reporting by Matthias Williams, Pavel Polityuk, Natalia Zinets and Alexei Kalmykov in Kiev, by Maria Tsvetkova and Maria Kiselyova in Moscow and by Francesco Guarascio in Brussels; Editing by Peter Graff)

Intensifying fight for Aleppo chokes civilian population

A Free Syrian Army tank fires in Ramousah area, southwest of Aleppo, Syria

By John Davison

BEIRUT (Reuters) – An upsurge of intense fighting around Aleppo has killed dozens of Syrians in the past weeks, displaced thousands and cut water and power to up to two million people on both sides of the front line, worsening the already dire conditions faced by hundreds of thousands in the city.

In a war already marked by humanitarian crisis, the United Nations says the fighting threatens to replicate deprivation recently suffered by those in rebel-held eastern districts of Aleppo among civilians living in the government-held west.

Advances by warring sides in the last month, which resulted in a siege of rebel-held neighborhoods and the severing of a major route into government areas of control, have choked off supplies and raised fears of the encirclement of the entire civilian population.

Syria’s largest city pre-war has been divided into government and rebel areas of control for much of the conflict, and has been the focus of escalating violence since a ceasefire brokered by Washington and Moscow in February crumbled. Its capture would a major prize for President Bashar al-Assad.

Russia’s intervention last year helped turn the war in Assad’s favor. His forces with the help of Lebanese Hezbollah and Iranian fighters surrounded the eastern, opposition-held neighborhoods in Aleppo in July.

The latest major gains were made by rebels, however, who broke the month-long government siege in an attack last week on a Syrian military complex and also cut the main supply route to the western, government-held areas of the city.

“When the attack began … rockets and shells were fired toward Hamdaniya,” said Abu George, a resident who fled that neighborhood, close to the military complex in the southwest of the city.

“There were people who had already been displaced sheltering in nearby areas, they had to leave,” the 61-year-old agricultural engineer said via telephone.

Rebel bombardments of Hamdaniya on Wednesday killed more than a dozen people, the Syrian Observatory for Human Rights monitoring group said. Syrian and Russian warplanes have launched heavily raided the areas taken by insurgents.

The British-based group said bombardments by both sides have killed more than 120 people in the city since the beginning of August.

Abu George is among thousands who fled areas in southwest Aleppo in recent days, according to the International Committee of the Red Cross.

“Thousands of families have been displaced from southwestern Aleppo, including already displaced families who’ve had to move for a second time,” spokeswoman Ingy Sedky said.

Residents of western Aleppo said cutting the main supply route to the government side had slowed the entry of goods and fuel and driven up food prices, but a delivery by government forces via an alternative route this week provided some relief.

“There were some problems with petrol and fuel, but supplies came in and the petrol stations are open and working,” Tony Ishaq, 26, said via internet messenger.

The alternative route used was until last month the only road into Aleppo’s opposition held sector. After intense bombardment, government forces captured the Castello Road in an advance that put eastern Aleppo under siege.

HOSPITALS HIT, WATER AND POWER CUT

The siege worsened an already dire humanitarian situation in eastern Aleppo, residents and doctors said.

The rebel advance which broke through the siege on Saturday has not yet secured a safe enough passage to make more than one food delivery to the east, or for civilians to move through, with government bombardments hitting that rebel corridor on the city’s southwestern outskirts.

“Fuel, vegetables and other essentials are not entering because the regime is bombing areas it lost like crazy,” said Hossam Abu Ghayth, a 29-year-old east Aleppo resident.

“There are warplanes and helicopters hovering in the skies, they’re bombing both civilian areas and the major front lines,” he said via internet messenger.

International medical charity Medecins Sans Frontieres, which supports a number of medical facilities in the opposition held sector, said the casualty toll had risen sharply.

“Because of the bombings and the fighting in Aleppo city there are more and more people coming to the hospitals,” Middle East Operations Manager Pablo Marco told Reuters.

Hospitals were having to cope with dozens of wounded arriving at the same time, he said, with only 35 doctors for the whole of east Aleppo’s population at least 250,000 people.

All eight hospitals supported by MSF have been affected by bombardments in recent months, Marco said. A U.S.-based rights group says several hospitals were hit in July.

The bombardments have compounded water and power cuts on both sides of the city.

East Aleppo residents have long experienced a lack of both.

“There’s no electricity – there are generators which provide a small amount, enough to work a fridge or lighting,” Abu Ghayth said.

“We wash once every Friday. We’ve got used to living this way,” he said. “We economize water so it lasts.”

Entire families often survive on 50 liters of water per day, transported from tanks or drawn from wells, he added. The World Health Organization says 20 liters are needed per person for basic hygiene.

The United Nations said on Tuesday the main power facility that allowed water to be pumped to both sides of the city had been hit, leaving the entire population of nearly 2 million without running water and putting children at risk of disease.

Sedky of the ICRC said residents were relying on underground water sources.

“The water pumping stations are not working anymore, on boths sides. So the whole population has been relying on boreholes for water,” she said.

Fetching water from those boreholes in some areas was dangerous, with movement restricted because of bombardments and fighting, Sedky added.

Wells and tanks would not provide enough water for very long, she said.

The U.N. has called for an urgent humanitarian ceasefire in Aleppo, and is pushing for a resumption of peace talks that have failed to end the five-year conflict in which more than 250,000 people have been killed and some 11 million displaced.

(Reporting by John Davison)

U.S. urges Russia to halt Syria sieges and allow humanitarian aid

People inspect a site hit by airstrikes in the rebel held town of Atareb

By Michelle Nichols

UNITED NATIONS (Reuters) – The United Nations Security Council must not allow civilians on both sides of the Syrian city of Aleppo to be cut off from humanitarian aid, the United States said on Monday as Russia accused Washington of politicizing a humanitarian issue.

Insurgents effectively broke a month-long government siege of eastern, opposition-held Aleppo on Saturday, severing the primary government supply corridor and raising the prospect that government-held western Aleppo might become besieged.

The United States, Britain, France, New Zealand and Ukraine organized an informal Security Council meeting on Aleppo on Monday with briefings by a “White Helmet” rescue worker and two U.S.-based doctors from the Syrian American Medical Society who recently returned from Aleppo.

“If the fighting continues it is conceivable that civilians on both sides of Aleppo could be cut off from the basic assistance they need. We cannot allow this to happen,” U.S. Ambassador to the United Nations Samantha Power said.

Citing U.N. figures, Power said Syrian government forces were to blame for nearly 80 percent of the besieged areas throughout Syria. Aleppo, Syria’s biggest city before the outbreak of the conflict five years ago, has been divided between government forces and rebels since the summer of 2012.

“We once again urge Russia to stop facilitating these sieges and to use its influence to press the regime to end its sieges across Syria once and for all,” she said.

The United Nations aid chief has called for weekly 48-hour humanitarian pauses in fighting to deliver aid to Aleppo.

Russian Deputy U.N. Ambassador Vladimir Safronkov accused the United States and its western colleagues of politicizing a humanitarian issue, urging them to “admit that the main cause of all of the humanitarian problems in Syria is not the counter-terrorist actions by the legitimate government of Syria.

“The propaganda and the emotional rhetoric, the unfounded accusations, the information campaign, means that we cannot move toward a political settlement in Syria,” Safronkov said.

He said the first step toward ending the five-year conflict should be a pooling of efforts to combat terrorism and then a renewal of Syrian peace talks.

A crackdown by Syrian President Bashar al-Assad on pro-democracy protesters five years ago sparked a civil war, and Islamic State militants have used the chaos to seize territory in Syria and Iraq.

The United States and allies began bombing Islamic State militants in Syria nearly two years ago, while Russia began air strikes in support of Assad a year ago.

(Reporting by Michelle Nichols; Editing by Dan Grebler)

New hacking group detected targeting firms in Russia, China

A padlock is displayed at the Alert Logic booth during the 2016 Black Hat cyber-

By Eric Auchard

FRANKFURT (Reuters) – A previously unknown hacking group variously dubbed “Strider” or “ProjectSauron” has carried out cyber-espionage attacks against select targets in Russia, China, Iran, Sweden, Belgium and Rwanda, security researchers said on Monday.

The group, which has been active since at least 2011 and could have links to a national intelligence agency, uses Remsec, an advanced piece of hidden malware, Symantec researchers said in a blog post (http://symc.ly/2aTHoOm).

Remsec spyware lives within an organization’s network rather than being installed on individual computers, giving attackers complete control over infected machines, researchers said. It enables keystroke logging and the theft of files and other data.

Its code also contains references to Sauron, the all-seeing title character in The Lord of the Rings, Symantec said. Strider is the nickname of the fantasy trilogy’s widely traveled main character Aragorn.

Separately, Moscow-based Kaspersky Lab has labeled the same group using the Remsec spyware as “ProjectSauron”.

The newly discovered group’s targets include four organizations and individuals located in Russia, an airline in China, an organization in Sweden and an embassy in Belgium, Symantec said.

Kasperksy said it had found 30 organizations hit so far in Russia, Iran and Rwanda, and possibly additional victims in Italian-speaking countries. Remsec targets included government agencies, scientific research centers, military entities, telecoms providers and financial institutions, Kasperksy said.

“Based on the espionage capabilities of its malware and the nature of its known targets, it is possible that the group is a nation state-level attacker,” Symantec said, but it did not speculate about which government might be behind the software.

Despite headlines that suggest an endless stream of new types of cyber-spying attacks, Orla Fox, Symantec’s director of security response said the discovery of a new class of spyware like Remsec is a relatively rare event, with the industry uncovering no more than one or two such campaigns per year.

Remsec shares certain unusual coding similarities with another older piece of nation state-grade malware known as Flamer, or Flame, according to Symantec.

Kaspersky agreed that the same group it calls ProjectSauron appears to have adopted the tools and techniques of other better-known spyware, including Flame, but said it does not believe that ProjectSauron and Flame are directly connected.

Flamer malware has been linked to Stuxnet, a military-grade computer virus alleged by security experts to have been used by the United States and Israel to attack Iran’s nuclear program late in the last decade (http://reut.rs/2b2FA8z).

(Editing by Greg Mahlich)

FBI took months to warn Democrats of suspected Russian role in hack

A lock icon, signifying an encrypted Internet connection, is seen on an Internet Explorer browser in a photo illustration in Paris April

By Mark Hosenball, John Walcott and Joseph Menn

WASHINGTON/SAN FRANCISCO (Reuters) – The FBI did not tell the Democratic National Committee that U.S officials suspected it was the target of a Russian government-backed cyber attack when agents first contacted the party last fall, three people with knowledge of the discussions told Reuters.

And in months of follow-up conversations about the DNC’s network security, the FBI did not warn party officials that the attack was being investigated as Russian espionage, the sources said.

The lack of full disclosure by the FBI prevented DNC staffers from taking steps that could have reduced the number of   confidential emails and documents stolen, one of the sources said. Instead, Russian hackers whom security experts believe are affiliated with the Russian government continued to have access to Democratic Party computers for months during a crucial phase in the U.S. presidential campaign, the source said.

As late as June, hackers had access to DNC systems and the network used by the Democratic Congressional Campaign Committee, a group that raises money for Democratic candidates and shares an office with the DNC in Washington, people with knowledge of the cases have said.

A spokeswoman for the FBI said she could not comment on a current investigation. The DNC did not respond to requests for comment.

In its initial contact with the DNC last fall, the FBI instructed DNC personnel to look for signs of unusual activity on the group’s computer network, one person familiar with the matter said. DNC staff examined their logs and files without finding anything suspicious, that person said.

When DNC staffers requested further information from the FBI to help them track the incursion, they said the agency declined to provide it. In the months that followed, FBI officials spoke with DNC staffers on several other occasions but did not mention the suspicion of Russian involvement in an attack, sources said.

The DNC’s information technology team did not realize the seriousness of the incursion until late March, the sources said. It was unclear what prompted the IT team’s realization.

Emails captured in the DNC hack were leaked on the eve of the July 25-28 Democratic Party convention to name Hillary Clinton as the party’s presidential candidate in the Nov. 8 election against Republican Party nominee Donald Trump.

Those emails exposed bias in favor of Clinton on the part of DNC officials at a time when she was engaged in a close campaign against U.S. Senator Bernie Sanders for the party’s nomination.

The DNC said on Tuesday that three senior officials had resigned after the email embarrassment.

Last week, Debbie Wasserman Schultz stepped down as DNC chairwoman as criticism mounted of her management of the party committee, which is supposed to be neutral.

U.S. officials and private cyber security experts said last week they believed Russian hackers were behind the cyber attack on the DNC. The Obama administration has not yet publicly  declared who it believes is responsible.

Director of National Intelligence James Clapper said last week the U.S. intelligence community was not ready to “make the call on attribution.”

It was not immediately clear how the FBI had learned of the hack against the DNC. One U.S. official with knowledge of the investigation said the agency had withheld information about details of the hacking to protect classified intelligence operations.

“There is a fine line between warning people or companies or even other government agencies that they’re being hacked – especially if the intrusions are ongoing – and protecting intelligence operations that concern national security,” said the official, who spoke on condition of anonymity.

The first internal DNC emails alerting party officials to the seriousness of the suspected hacking were sent in late March, one person said. In May, the DNC contacted California-based cyber security firm CrowdStrike to analyze unusual activity on the group’s network.

The Brooklyn-based Clinton campaign operation was also the target of hacking, people with knowledge of the situation have said. The Clinton campaign has confirmed that a DNC-linked system the campaign used to analyze voter data was compromised.

Yahoo News reported last week that the FBI had warned the Clinton campaign that it was the target of a hack in March, just before the DNC discovered it had been hacked.

Glen Caplin, a Clinton campaign spokesman, said it had taken steps to safeguard its internal information systems.

“Multiple Democratic party organizations, including our campaign and staff, have been the subject of attempted cyber attacks that experts say are Russian intelligence agencies, which enlist some of the most sophisticated hackers in the world,” Caplin said.

(Reporting By Mark Hosenball amd John Walcott in Washington and Joseph Menn in San Francisco; Editing by David Rohde and Grant McCool)