Russia has accused the United States of turning a blind eye to the trafficking of oil into Turkey from Syrian areas under Islamic State control, after Washington called the amounts involved insignificant.

Russian Defence Ministry said on its Facebook page that when United Sates officials say they don’t see how the terrorists are smuggling oil to Turkey, it smells badly of a desire to cover up the act.

US special envoy and coordinator for international energy affairs, Amos Hochstein said that the amount of oil smuggled into Turkey from areas of Syria controlled by the Islamic State group is of no significance from a volume perspective both volume of oil and volume of revenue. His comments came after Moscow accused Ankara of profiting from the trade.