LoveUniHateExams: You know there are people in the Kremlin who are more hawkish and nasty than Putin, right?
I have no doubt that there are. I am guessing that they would not be seeking to replace Putin if he were to be pushing the nuclear option, assuming it is what they would also do. But I don't see where things work out for Russia if they use nukes. Who will they nuke? Ukraine? That would risk damaging or destroying the valuable land and resources that make the whole war worth their while. Europe? NATO would have no recourse but to respond, and respond forcefully. And such a move would likely force China and India (and any other nations) to get involved in some way, even if it's just to denounce them. The US? That's a good way to usher in the end of the world, one way or another.
Being more hawkish than Putin doesn't strike me as a good way forward for Russia.