what was Trump going to do if they took Taiwan? send mean tweets. Nobody wants wars between advanced countries anymore, the cost in hardware and life would immense. so in reality China could take over Taiwan whenever they want and i doubt Bush, Obama, Trump, or Biden would do anything meaningful to stop it except sanctions. Now if they started killing hundreds of thousands of Taiwanese that would change but I don't think they would have to, not much of a fight would get put up. What did Trump do as China took back full control over Hong Kong? nothing but tweets.