Russia vows to strengthen Syrian air defences after US strike

“I think that a key piece of the puzzle is that the US had to provide the Russians with sufficient warning to evacuate any aircraft and personnel before the strikes, which will have been immediately passed to the Syrian Air Force allowing any operational jets and key equipment to be evacuated too. Furthermore, it will have given the defences prior warning to be ready,” said Justin Bronk, an analyst at the Royal United Services Institute in London.