He'd need to buy the Ukraine before he could offer it up as a prize. This isn't going to happen
I'd give him maybe sixty to ninety seconds against Putin before he was dead -- you don't get a 6th dan in Judo without lots of skill.
If he said "if Putin wins I'll give Tesla to Russia" that would have been less insulting to Ukraine, but of course that also wouldn't be his call to make because he doesn't own Tesla, the shareholders do.
Musk is a true muppet.