Moments ago, the Russian Ministry of Defence (MoD) released an official statement saying that the Russian military would respond to any US aggression that threatened its forces in Syria.
Breaking: Russia vows to respond if forces in Syria threatened by US strikes, knows US is planning false-flag chemical attack
The statement more specifically eluded to a possible US strike against Syrian government targets in Damascus where Russian forces have a presence.
Moscow is convinced that the US plans to use proxy elements in Syria to carry out a false flag chemical weapons attack that will be blamed on the Syrian Armed Forces and used as a pretext for military action.
Updates to follow.