Killing Russians for Taiwan? What?

The U.S. can’t hand out guarantees to every state that might theoretically need them.

Dmitri Alperovitch asks a strange question:

Should the US defend Ukraine against possible Russian invasion to have credible deterrence for a Chinese invasion of Taiwan scenario?

Put another way, should the U.S. risk war with a nuclear-armed state for a non-ally when it has no vital interests at stake to convince a different nuclear-armed state in another …