>"China has violently annexed sovereign countries in the past decades."

An outright lie. The only possible candidate is Tibet but it's former sovereignty is very questionable and not clear cut

> it's former sovereignty is very questionable and not clear cut

Same as Taliban-run Afghanistan, same as Iraq, same as Ukraine, same as Taiwan. If you’re Tibetan, the line is academic—you faced, by modern definitions, genocide all the same.

Calling the territory you’re invading and/or annexing illegitimately independent, illegitimately governed is how these always go.