I don't actually know anything about Russia or Europe or politics in general first hand. However, from listening to a few episodes of the Economist podcast, my impression has been that Putin is stuck. He can't quit because even though he might be above being punished for his crimes, his cronies who have amassed billions are not. These folks will do everything in their power to keep Putin in power or find someone who is better at diverting people's attention from the problems affecting the people in their regular lives. Chechnya, Crimea, Ukraine, ... all these are (in my understanding) in service of the government's attempt at consolidating power at home.
> Nobody wants nuclear war, maybe some kind of super-sanctions would be the only recourse for the west, cut them off everything, and I mean everything.
What is a super sanction? In my (uninformed) opinion, a sanction is a complete sealing of a nation backed by political will and military might, preferably consensus from all the neighbors of the nation. No person and no goods go into or out of the country. No funds get transferred into the country or out of the country. All communications get cut off.
Correct me if I am wrong but Europe (I am speaking geographically, so including Ukraine) relies a lot on Russian petroleum and gas? And even if we weaned ourselves off of everything Russian, there is a border between Russia and China PR (mainland China under control of the CCP). https://en.wikipedia.org/wiki/China%E2%80%93Russia_border
tl;dr a sanction not enforced by military might is not really a sanction, it is just a silly little non-binding resolution.