Why are we discussing conventional warfare and dead Russian/Soviet leaders? The elephant in the room is this: what if Putin erases Kyiv in response to a violation of 'territorial sovereignty'?
What does the West do? Further escalation is unthinkable. Putin wins the game of brinksmanship on the spot, right?
If we turn Russia into a pariah state in reply and try to strangle Putin economically, does this not only delay the day of reckoning? If we try to get China and India on board, and they come back with, "Taiwan, the South China Sea, Kashmir and buzz off about fossil fuel emissions," then what?
Are we really down to our own one-shot gamble for resurrection of smuggling a suitcase bomb into Moscow without getting caught, and hoping cooler heads over there win out when the radioactive dust settles? I don't see a lot of other pathways forward besides rolling over.