The relationship between the ICC and the "great powers" is an interesting one. It sort of separates the normal alliances of "west" and "non-west" alliances, and reshapes them into powerful and non-powerful. And it seems this conflict is ongoing.
Apart from Europe, the number large, powerful non-signatory countries is pretty significant: US, China, India, Russia, Iran, Saudi, Egypt, Turkey, Indonesia, and more.
I've always thought it is interesting that the concept of international law is by definition in conflict with the de facto anarchy of international relations. I've always had mixed opinions on the topic, simply because you can look at an institution like the UN, and see that it functions much more successfully as a simple forum than a deliberative body. The idea that somehow we are going to implement something as difficult as a criminal court on an international basis seems... very idealistic. A court like this always seems sensible at first glance, but I'm not sure it can really exist effectively at all over any serious time horizon.
>interesting that the concept of international law is by definition in conflict of the anarchy of real Realpolitik
not 'by definition'. There's a fairly good case to be made that playing by, and being able to set, international norms is in the long term interest of powerful countries. For one because you don't know when you'll cease to be powerful, which will happen given enough time and secondly because even smaller players can cause significant damage when acting without constraint, a lesson several great powers are currently learning for the umpteenth time.
It's very meathead schoolyard bully coded to think that anarchy benefits you just because you happen to be the biggest dude around. It speaks more to the intellect of current leaders than it does to some fundamental contradiction.
The concept of international law outside of its jurisdiction is just a rebranded form of imperialism. How’s it different to a US Federal court deciding it has jurisdiction in Canada?
Especially as ultimately the only way to actually enforce any law is with violence (without which a court is impotent and its laws meaningless).