If the PRC should actually decide to invade, it is going to be extremely difficult to hold that off on their own for an extended period of time. Which means they need allies who can rapidly deploy a sufficiently large force to stabilise the situation.
But the only way to get there is with a naval force, and air supremacy would likely be critical to the outcome of that fight, which means you need someone with a large carrier fleet, and that is pretty much a pool of one.
Without US help, there is very little hope that Taiwan would not be overrun sooner or later. Their only real hope would be a nuclear weapons programme that would allow them to credibly threaten to nuke Beijing if invaded. But the PRC would never let it get that far and would make sure to strike before that could be completed.
Probably also increased military and economic ties to South Korea and Australia, and an effort to build a NATO of the area, absent the US, perhaps under ASEAN. Or something new.
It’s a tough problem but it’s a real problem and I don’t see how Taiwan could ever go back to trusting the US to defend democracies facing invasion.
1) Trump might be alienating his traditional allies and cosying up to Russia, but he still apparently sees China as a problem or adversary.
2) Thinking purely transactionally, the US is very dependent on Tiawan due to TSMC. Most of the US' largest tech companies are investing heavily in AI hardware (TSMC chips) and/or rely directly on TSMC for their own supply chain. I have no idea whether Trump et al see it this way, or this would be enough to trigger the US to protect Tiawan, but transactionally, it's immeasurably more valuable to the US than Ukraine.
That's not a guarantee at all. The only thing he's every been honest, consistent and truthful about is that nothing is sacred, everything's on sale, no values (economic, patriotic, environmental, political) will stand in the way of his own profit, there's always the willingness to make a deal and sell something (someone) off, and fuck the consequences, no matter how gigantic, embarrassing, and suicidally bad they are. Negative-sum deals are absolutely on the table as long as he comes out richer or more powerful.
China just needs to make a good offer and Taiwan's fucked when it comes to Trump's support.
"Let us take Tiawan and we'll give you TSMC for the next n years" would probably be a pretty strong offering.
It seems to me it's hard to believe anything Donald says, or to think it could not change without warning in the near future.
All it would take for a pro-China pivot is the right leverage. Cash, blackmail, who knows. But it’s just a matter of whether the price is met, not whether the deal is available.
I wonder if he knows what any of that means.