Until Turkey gets out of NATO , then you wouldn't know what Russia would have done differently. Turkey can always try and see for itself.
Russia doesn't need to seek confrontation with Turkey(or whatever that means). Russia would have simply retaliated in kind, probably destroying all Turkish aircrafts based near the border with Syria. We all know how quick things can escalate quickly giving such chaotic scenario. So the rest is left for the main actors to decide what would have happened next. It never came to this point precisely because Turkey is a NATO member, and so attacking it would have carried FARRRRRRRR more risk for Russia than attacking a lonely weaker Turkey.
Imagine a Turkey which is out of NATO and hostile to the West, it won't even have the necessary spares/equipment(which are almost exclusively from western countries) to even sustain any war whatsoever with a large power like Russia and Russia will be well aware of that.
So it would have been FARRRR easier for Russia to target a lonely vulnerable Turkey than otherwise. Same as it was more easie for the U.S/UK to target a lonely vulnerable Iraq(even during the first gulf war).
As for Cutting gas supplies to Turkey, they dont necessarily need to do that, since they get alot of money from it anyway. Even with Ukraine Russia still delivers alot of oil to them, despite carving out the country and fighting an indirect proxy war with the Ukrainian government. Lol Realpolitik I guess.