Comment by immibis

The EU is not sovereign. Member countries can just outright ignore EU law (see: Hungary or the former UK) and the only recourses are civil things like issuing declarations, withholding payments, crossing them off treaties, or kicking them out of the EU. There are no EU police that can be involuntarily forced on a country the same way the USA can send armed federal police or military into its states. Doing anything like that would be a declaration of war.

A state is a monopoly on violence and EU member states overwhelmingly control their own.