I see SK and Japan also as necessary allies for the EU. But if China decides to take Taiwan, I don't think there's anything the EU could possibly hope to do about it; Taiwan remains independent because the US guarantees their independence. If Trump were to withdraw that guarantee too, I don't think there's anything that can save Taiwan.

It sucks, but the EU has more urgent problems closer to home. All I can hope for is that Trump hates China enough that he'll continue to guarantee Taiwan's freedom. But I'm sure at some point he's going to ask them for some more material "thanks" too.

But yeah, the EU's relationship with China should not be the same as that with other allies. But I think there's room for some cooperation, and the EU might not object too loudly if China were to take outer Manchuria back, for example.