The sides do seem to be lining up. The question mark is NATO. I don't think NATO has to support Turkey if Turkey invades another nation, but is NATO hellbent on a war rather than acknowledging Russia's accomplishments?
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At least 4 NATO members called for the overthrow of Assad and planned to bomb Assad on 'suspected use of chemical weapons" that would be the USA, France, UK and Turkey and at the same time have sent weapons, money and advisers to train the Syrian rebels. So the biggest NATO nations wanted to get in a shooting war with Assad's Syria to overthrow him.
And Putin scared the hell out of NATO and they hate him for blocking their plans in Eastern Europe.
So I don't know what will happen - this has the potential to lead to a limited nuclear exchange or worse.