I don't think China and Russia would stand idly by while their ally was being attacked from the West.

They learned the folly of that in Libya.

Military weapons are not now the only ones in the locker.

The West wants turmoil in the Middle East at the present time, the Russians and Chinese want stability. Its all about economics.

I do think that the "Arab Spring" was encouraged and aided by the West, in full knowledge of the human catastrophe that was to follow.
Anyone with a modicum of sense knew that Western style "democracy" was impossible.

"Democracy", even our delusion of democracy cannot be transplanted.