According to the U.S. Department of defense, the Russian part, located on the territory of Syria, preventing a fight against ISIS (an organization banned in Russia). On these findings of reports RT after studying the report of the General Inspectorate of the Pentagon.
As noted by the American military expert, the Russian military presence in Syria continues to hamper the military action against the terrorists of ISIS. For example, the Russian air force, as before, continues to maneuver dangerously close to a U.S. air force aircraft.
Also, the American side is dissatisfied with the statements coming from the defense Ministry, which indicated that the American part of have to leave ATS due to the fact that the military action against ISIS is almost complete. “In this regard, it is not excluded that this year coalition forces will be increased pressure through diplomatic and military channels in order to achieve their withdrawal from Syria,” the report by the U.S. defense Department.