President Barack Obama met with his Turkish counterpart on Tuesday in Paris, reportedly asking Tayyip Erdogan to reduce tensions with Russia over the downing of a warplane last week.

The two leaders met during the COP21 climate change summit, according to published reports.

Tensions between Turkey and Russia have been high since a Turkish jet shot down a Russian warplane last Tuesday. The two sides have disputed the sequence of events surrounding the incident, with Turkey saying the Russian plane ignored repeated warnings and violated its airspace and Russia saying its plane never entered Turkey and no warnings were provided.

The BBC reported that Obama continued to support Turkey’s right to defend its airspace (the United States believes Turkey’s version of the events), but stressed Turkey and Russia need to find a diplomatic solution and not detract from the common goal of defeating the Islamic State.

Those calls were dealt a setback just hours later, when the Russian government announced a slew of sanctions against Turkey. In a message on its website, Russia said it won’t buy certain raw material and food products from Turkey and also banned charter flights to the country.

Obama also asked Turkey to do more in the fight against the Islamic State, according to Reuters. He reportedly asked the country to close off its border with Syria to help prevent the Islamic State insurgents from importing oil, which they use to make money, and manpower for their causes.