Summary
Trump and Zelenskyy’s confrontational Oval Office meeting advanced “mob boss foreign policy” serving Russian interests.
Trump and Vance bullied Zelenskyy when he refused their “extortionate” minerals deal or to thank them despite Trump’s stated intent to reduce support for Ukraine.
Zelenskyy effectively countered their claims by noting Russia’s 2014 invasion and correcting historical inaccuracies, which angered the Americans.
This represents the first openly “anti-US, anti-Western, anti-democracy foreign policy in American history.” Russians embraced it, and Putin ally and former Russian president Dmitry Medvedev celebrated the exchange.
China, the US, and Taiwan view Taiwan as belonging to China as per the One China doctrine.
No, they dont
As is confirmed in your first link, the USA acknowledges that the Chinese position is that Taiwan is a part of China, and recognise that the PRC is the government of China, they deliberately do not say if they consider Taiwan a part of China or not.