Russian President Vladimir Putin on Monday accused Turkey of shooting down a Russian warplane last week in order to protect oil supplies from Islamic State militants to Turkey. Revenues from selling oil make up a large source of income for ISIS. Agence-France Presse reported that Putin said Russia has “every reason to believe” that their warplane was shot down for this reason. He also said, “We have received additional information that unfortunately confirms that this oil, produced in areas controlled by [ISIS] and other terrorist organisations, is transported on an industrial scale to Turkey.”

Putin’s statement was made in France on the sidelines of the climate change summit, a few hours after Turkish Prime Minister Ahmet Davutoglu again refused to apologise for shooting down the Russian jet last Tuesday. The Russian President also declined a meeting with Turkish counterpart Recep Tayyip Erdogan in Paris on Monday, AFP reported. Putin claimed that many leaders he had spoken to at the climate change conference agreed that it was unnecessary for Turkey to have shot down the plane, and said that the anti-IS coalition was threatened by Turkish action. “We will always support [the idea of a grand coalition] but we won't get there as long as some people use terrorist groups to serve their short-term political interests,” Putin said.