[zie]

Because Taiwan has such a large export of stuff the USA desperately wants/needs, I'm not sure you are right that the USA will let China take Taiwan. See TSMC for one example :)

What does the USA need/want from Russia, other than for them to stop being antagonistic against the USA? Nothing that I can see.

[mywittyname]

Okay, so China promises no interruption in supply if there's no American intervention.

[saiya-jin]

If Taiwan military blows up critical parts of fabs upon invasion, China can promise whatever they want, its just empty words. Also, as we can see here, promises mean less than fart in the wind to states if its lucrative to break them