The Russian Defense Ministry announced it is halting cooperation with its US counterparts in the framework of the Memorandum on the Prevention of Incidents and Ensuring Air Safety in Syria following the coalition’s downing of a Syrian warplane.

The ministry has demanded a thorough investigation by the US military command into the incident with the Syrian government military jet, with the results to be shared with the Russian side.

“In the areas of combat missions of Russian air fleet in Syrian skies, any airborne objects, including aircraft and unmanned vehicles of the [US-led] international coalition, located to the west of the Euphrates River, will be tracked by Russian ground and air defense forces as air targets,” the Russian Ministry of Defense stated.

Downing the military jet within Syrian airspace “cynically” violates the sovereignty of the Syrian Arab Republic, Russian military said.

The actions of the US Air Force are in fact “military aggression” against Syria, the statement adds.

The ministry emphasized that Russian warplanes were on a mission in Syrian airspace during the US-led coalition’s attack on the Syrian Su-22, while the coalition failed to use the communication line to prevent an incident.

“The command of the coalition forces did not use the existing communication channel between the air commands of Al Udeid Airbase (in Qatar) and the Khmeimim Airbase to prevent incidents in Syrian airspace.”

The ministry considers the move “a conscious failure to comply with the obligations under the Memorandum on the Prevention of Incidents and Ensuring Air Safety in Syria,” and is thus halting cooperation with the US within the memorandum framework as of June 19, the statement concluded.

Earlier Russian Deputy Foreign Minister Sergey Ryabkov condemned the attack, branding it an act of aggression which actually helped the terrorists the US is fighting against.

The US-led coalition downed the Syrian government warplane on Sunday. At the moment of the attack the jet was carrying out operations against Islamic State (IS, formerly ISIS/ISIL) some 40km from Raqqa, the Russian Defense Ministry said. The pilot ejected from the plane above IS-controlled territory and is still missing.

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