Fortunately, school playground bullies don't carry around nuclear weapons in their school satchel.
I think we should assume that Russia would use nuclear weapons; NATO, rightly, doesn't appear willing to risk using them against Russia, it would mean a nuclear exchange and catastrophe. So the concept of NATO doesn't solve the problem we are now faced with. That's why I'm thinking about how else it can be solved. I'm open to being proved wrong.
So we have a nuclear-armed state invading a sovereign neighbour.
Due to the latter's resistance, it is now shelling civilians. We are making this situation worse by encouraging the underdog to fight (while not being able to engage Russia directly).
Remember that the Russian conscripts apparently don't want this, but apparently they have no choice. So by carrying on fighting they are getting them killed too.
If Ukraine agrees to Russia's terms, they will live - I think that is clear.
I would rather plough my fields under an occupier who is being punished with sanctions than be blown up along with my family.