Russian Prime Minister Dmitry Medvedev has accused Turkey of protecting Islamic State (IS) militants, saying "some Turkish officials" have "direct financial interest" in the sale of petroleum products produced in IS-controlled factories.
Medvedev made the comments in Yekaterinburg on November 25, one day after the Turkish Air Force shot down a Russian warplane along the Turkey-Syria border. One Russian pilot was killed in the incident.
Medvedev said the downing of the Russia jet amount to "the protection of militants of the Islamic State terrorist group."
He added that relations between the two countries "have been undermined" and warned that unspecified joint projects could be canceled and Turkish firms could lose their positions in the Russian market.
Ankara says the Russian Su-24 repeatedly violated Turkish airspace and failed to respond to 10 warnings before it was shot down.
Russia has lodged a "strong protest" over the incident with Turkey's ambassador to Moscow, and Foreign Minister Sergei Lavrov has cancelled a visit to Turkey that had been scheduled for November 25.