Well I think Russia will use Nuke to prevent anymore loss around Crim.
Especially if the army can’t stop Ukraine.
Russia may even use it to freeze the battlefield for winter. Though I doubt that is going to work.
They use Nukes and Russia runs the risk of losing Moscow. Nukes will end Russia because they will then be isolated from the entire world in everything they do. Its not going to happen and if to does happen it has sealed the fate of Russia, it will be over for them. As incompetent as Putin is i don't see him making a move that will end Russia.
Remember what I said in an early post pay no attention to what the Russian clowns have to say, its all a deception and smokescreen. The Russians hope that you fall for it so that can stop you from fighting the war to liberate your land.