Russia would have to go through Georgia/Armenia or Romania/Bulgaria to go straight land war without having to ship troops through the Black Sea for an amphibious landing in Turkey. I doubt any of the above would agree to let Russia do this. I doubt that Russia could create a bridge head then control a port then keep it repaired for anything else.
So maybe not at this point. That's throwing out the NATO factor. Then they are getting smacked around by NATO as well.
SO Hard NO.