Which begs the question, why should the EU see China as an adversary? That's mostly an American thing, the Pacific doesn't really concern us.
Maybe alliances will reshuffle in the future?
Authoritarian regimes will inevitably attempt to expand because authoritarian leaders view the existence of people they don't rule as a threat towards their rule and they inevitably desire to grow their control and power over more and more people.
Which is ironic that most of the annexation talk came from the US in the recent times, not from China. Canada, Greenland, Panama Canal, Mexico what else has he threatened to annex?