Russia has warned the US-led coalition fighting in Syria that it will view its aircraft as targets, after a Syrian military plane was shot down.
The coalition said it had shot down the Syrian SU-22 after it bombed US-backed rebels in Raqqa province on Sunday.
Russia, Syria’s main ally, said it was also halting communication with the US aimed at preventing air incidents.
Syria condemned America’s “flagrant attack”, saying it would have “dangerous repercussions”.
“Any aircraft, including planes and drones belonging to the international coalition operating west of the Euphrates river, will be tracked by Russian anti-aircraft forces in the sky and on the ground and treated as targets,” the Russian defence ministry said.
It denied the US had used a communications channel before the SU-22 fighter bomber was downed.
The memorandum of co-operation with the coalition aimed at preventing air incidents and guaranteeing flight safety was ending as of Monday, the defence ministry added.