We have no defense pact with Taiwan, and are not obligated to engage. Our official stance is strategic ambiguity, but Ukraine has showed how unlikely we are to

We have no defense pact with Taiwan, and are not obligated to engage. Our official stance is strategic ambiguity, but Ukraine has showed how unlikely we are to join the fight. We will try to follow much of the same sanctioning, intelligence, and providing arms playbook, but with less international support. Your scenario presumes we are in open conflict with Chinese troops, in which case landing marines is merely an escalation of a war that’s already begun.