Who in the hell said he wants to "topple Assad"? YOU??
You look like Chicken Little, running around here.
I'm not for "toppling" anybody. Not our job. I don't like Russia propping people up, either. It creates and emboldens tyrants, who in turn attack others until they eventually end up on our shores, knocking buildings full of innocent Americans ever.
This is the usual proxy thing we have vs Russia, and their job is considerably easier. We're trying to settle the place down, and they're trying to destabilize it. That's far easier to do in an inherently unstable region.