Neither can the US. Imagine Europe supporting China in exchange for China backstabbing Russia - entire Ukraine and Belarus and maybe even Kaliningrad suddenly are up for grabs for EU while China gets Russian territories that it has historical claims to. Then China gets access to European technology (ASML and Airbus) which means that the US stops having massive technological advantage and suddenly the conquest of Taiwan starts being more realistic. China and Europe are too far away physically to come in direct conflict, especially as EU doesn't care about being a superpower.
This is unimaginable right now, but the more EU decouples from the US because of its unreliability, the more it might actually work out.