> What happens if Ukraine is given sufficient support to start winning and Putin decides to go nuclear?
That is a possibility. But there is a large cost associated with going nuclear. And that is why he hasn't done it, even after losing hundreds of thousands of soldiers.
Also, if you give Putin what he wants, because he might go nuclear, then the race to develop nukes will really heat up by all non-nuclear nations.
US signed Budapest memorandum. We promised to help defend Ukraine, if it gave up its nukes. Now we are trying to shake them down like a mafia. And also asking them to give in to Putin's demands, without asking Putin to give up anything.
We have fallen very far.