Russia took USA on sight.

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The Ministry of defence terminated the Memorandum on safety of flights over Syria.

The defense Ministry will stoped communicating with the Pentagon in the framework of the Memorandum on the prevention of incidents and ensure the safety of aviation operations in Syria. The decision Russia made after the U.S. military aircraft the shot down a Syrian fighter-bomber su-22 in the sky of Raqqa. In Washington said that the plane was shot down in self-defense, as the Syrian army attacked positions of the US-backed Alliance SDF.

However, as stated in the defense Ministry, the command of the coalition forces don't warned the Russian colleagues about the operations on the existing channel of communication between the American air base al-Udeid air base in Qatar and the Russian base Hamim in the Syrian Latakia.

The defense Ministry called the incident a "military aggression" and promised to monitor any aircraft and drones in Syria.

https://www.gazeta.ru/army/2017/06/19/10728671.shtml#page2