[notaround1111]

Korea ended in a draw b/c the soviet union was entering the conflict in support of mostly defeated NK/PRC forces and the fear was it could escalate into a nuclear war.

Vietnam is more interesting but I think it's very unlikely that a conflict with the PLA today would unfold in the same way.

Figuring out what type of conflict would force China into a nuclear exchange is probably the only question worth asking. would liberating Tibet and Xinjiang do that? Probably, but it also could be the case that Beijing wouldn't risk being vaporized themselves for a people and place they deem so inferior.