It does seem that Russia will be the gatekeeper in that region. Better them than the crooks of Kiev.
A bigger threat is if Assad falls, in that vacuum ISIS has a corridor to the Med. The US is still working for that.
Stability is the only thing that will stop ISIS. Everything the US is doing works against that.
As far as Turkey is concerned? They have a concern of their own. That would be the demands that are inevitable for an independent Kurdish state that would include a lot of their real estate.
If Syria falls, what problems you see now will be multiplied by five. Welcome boots on the ground and great troubles in Lebanon and Jordan.
Because it's so much better if the crooks in Moscow are running everything, you Putinist toadie.