In EU countries with independent court systems, those EU governments routinely ignore court decisions they don't like. I did a very deep dive into this. There is no European country where checks and balances consistently, properly work.

Surprisingly enough among EU countries, Austria gets relatively close to adherence. Canada is likely the best at it globally (and yes, that takes into account "notwithstanding").

How is the EU relevant to the ICC?

EU countries have different systems, lots of countries in the rest of the world are ICC members have independent court systems?

I think people here often forget that most of the world is neither the US or the EU.