> International relations is only literally anarchy if you take the realist school of thought as representing IR.

It's literally the state of things: "there is no hierarchically superior, coercive power that can resolve disputes, enforce law, or order the system of international politics. In international relations, anarchy is widely accepted as the starting point for international relations theory." (https://en.wikipedia.org/wiki/Anarchy_(international_relatio...).

If you know of such an authority, please point it out. The UN is not it.

Anarchy doesn't mean constant conflict or power politics or anything like that.