Something others have not said:
Trump is very fickle, and manages the country like his business empire, like an autocrat. Everything to him must be a direct quid-pro-quo, so if he does not directly see the benefit of something, it’s ‘the worst ever’ and he will not go or earlier agreements.

Wel in international politics, everything is about your reputation as a country and your reliability.

Many countries, EU and APAC have traded on the US as a reliable party, for safety, security and stability (even though plenty of other countries will disagree).

Trump and the Republican congress are showing that when push comes to shove, the US has politicians that would rather play politics than help allies.

This forces these countries to re-evaluate their dependence.

Keep in mind that the US believes a conflict with China is on the horizon and inevitable. But how the US will fare against a near peer advisory without their APAC allies, and without the EU cutting economic ties if the conflict erupts is probably not going to be well.