Russia will be weaker in the future, and it is by no means certain they will be our enemy in the future. They do not need to be, we have no conflict of interests, as we did with the Nazis or the Soviets.
Since this thread is dealing in 'what if's' - I question the theory that involving ourselves further in Syria will start a war with Russia
at this time.
Putin
is a Soviet, and exhibits many of the characteristics of a 'Hitler' in the making. His actions in Georgia and the annexation of Crimea - both just happening to have strategically positioned seaports, for two examples. If he can keep the criminal element satisfied, and the people unified in fear of the boogie man (the West, for example three), as their lives improve, his strength and influence will continue to grow.
The US and Russia are competitors, in oil. Putin controls a significant portion of Europe's energy, a role we are threatening to fill. His involvement in Syria, and alignment with Iran are simply chess moves - he is not in a position, nor willing at this time, to jeopardize what is proving to be a very profitable game. He enjoys butter on his bread.
Russia and the US are not friends, but we do not need to be enemies either. Putin stepped in and offered to rid Assad of chemical weapons, an offer the previous administration accepted with a big sigh of face-saving faux relief...knowing that would not happen. So the people of Syria pay the price...and we have to ask ourselves - did we give the rebels false hope.
I believe it is a mistake to underestimate the
future strength and intentions of Putin's Russia - right now I think he's 'winging it, testing the boundaries. I respect his ability to maneuver on the world stage.
All that to say, though a military confrontation with Russia in Syria would not be a good thing, I would take them out of the equation...and the
only answer I would demand from the advocates of unilateral action in Syria..."TO WHAT END?"