russia is a much better target for expansion and access to resources. under the current putin regime in russia the usa will do nothing to stop it.  taiwan on the other hand offers little besides a political victory. the usa will hit the tsmc factories with everything short of nuclear weapons. bunkers busters will be used to completely destroy the foundation and probably plant deep unexploded deep into the ground of the plant. after that tonnes high explosive and napalm like bombs to wipe the rest clean. it will be completely useless as a chip manufacturer.  thats is if they dont turn to fish food on the trip over.  the end result will be an island of people that hate the ccp and of little use. they will add only useless eaters to their population.  meanwhile russia does not have the land forces to stop china. it is connected by land. they can walk into russia. there is not geographical barrier. only the sheer size of it.
United States