Obviously the Russians are ratcheting up the ante with talk of "war" between the US and themselves. While this is almost certainly bluster, it does and must give the civilised word pause.
If not military action is the finally decision (which I doubt it will be), well, the US has shown that they are prepared to take drastic non-military action against Russia, for one, which ultimately might involve cutting them out of SWIFT altogether, putting pressure on FIFA to postpone the World Cup, or simply tightening the noose further on the stolen funds Putin holds in US banks.
However, none of that addressed the issue of making a deterrent statement about the future use of chemical weapons by Syria or anyone else.
What part Russia actually plays in the direction on Syria's chemical war effrot no one knows, at least not in the unclassified world. A few weeks ago the head of the Russian armed forces himself actually stated that Stria was planning a chemical weapons attack. Why he did that is not clear.
What with the Salisbury attack also, it seems plain that Russia itself is an active player in the world of chemical weaponry, not merely as partner in Syria's crimes.