These kinds of morally-superior, we'll show them, type of attitudes and suggestions are precisely why so many folks have come to be anti-EU. Nevermind the actual other real day-to-day issues with the organization.
I'm sure you're also staunchly against Scotland and any referendum to join the EU, and against Catalonia becoming independent as well? Why should Taiwan be an exception and not part of China? Seems many of the EU are of the opinion that "We support sovereignty when it conveniently aligns with my chosen organization".
The default and perhaps what is best for democracy is to have many smaller nation states, city states, and the other various confederations and the like. The super-organization of nations into these unwieldy states is in many respects anti-democratic and perhaps only temporary as these large nations and alliances were built precisely to fight other, large nation states.