We have seen developed nations continue trading with (and in some cases even increase their trade with) countries that have received international condemnation that should have seen unilateral embargos.
To name the first three that come to mind:
- Russia-Ukraine (land grab) - EU and Germany in particular increasing trade with Russia, particularly in terms of gas procurement when Russia should have been sanctioned into the ground
- Russia-Britain (killing on foreign soil) - same as above
- North Korea violating nuclear and ICBM testing treaty - most countries ceasing to trade openly, but continuing "off the books"
The US (non-nuclear) defence policy on Taiwan is deliberately ambigious, and the US has no defense treaty (beyond arms sales) with Taiwan.
To quote Wikipedia[3]:
"The Taiwan Relations Act does not guarantee the USA will intervene militarily if the PRC attacks or invades Taiwan... America's policy has been called "strategic ambiguity" and it is designed to dissuade Taiwan from a unilateral declaration of independence, and to dissuade the PRC from unilaterally unifying Taiwan with the PRC."
[1] https://en.wikipedia.org/wiki/Nuclear_umbrella
[2] https://www.defense.gov/Explore/News/Article/Article/1822953...
This act is bull\w{4}, like many other defence treaties. The final word is always behind the executive power everywhere, and whether they have balls to go to war.