Russia isn’t going to start World War III over a missile strike by the U.S. in Syria.
............or ANYTHING else....................up to and including blowing one of their warships completely out of the water and into a billion pieces..................
it’s just not in their DNA...............
YES, it was at Stalingrad and on the way to Berlin after Stalingrad but there’s no history since WWII of Russia having the stomach for a big fight with the US. And, we should at least consider that when worrying about a confrontation with them or announcing another 3 billion dollar airplane for the Air Force.