We all agree that China is morphing into a bigger threat than Russia. That said, history says that it's a bad idea for us to pretend that we won't get pulled into a war in Europe. We can't afford to pretend that Russia isn't a problem just because China is a bigger problem.
And for what it's worth, if we don't care about Ukraine, why don't we leave instead of going full Mafia Boss and saying, "Hey...somethin' bad might happen if you don't give me some of your valuables to show that you respect our protection". Why are we trying to get a half a trillion worth of rare earth metals and other natural resources if we don't want to be involved?
HINT: It's called talking out of your ass and it's what Trump loves to do.