BBC News | Turkey challenges Russia over IS oil trade claim BBC News Turkey has challenged Russia to prove its claim that Ankara shot down a Russian plane in order to protect its oil trade with Islamic State (IS). "If you allege something you should prove it," Turkish President Recep Tayyip Erdogan said. He was ... Moscow alleges Turkey shot down plane to protect oil trade with ISIS Turkey shot down Russian fighter to protect its supply of oil from ISIS Erdoğan challanges Putin to resign if he can't prove Turkey buys oil from Daesh |