Steve Bannon, as we know, has no use for international entities and agreements. In his view, everything revolves around the power and values of individual nation-states. In particular, he wants the US and European countries to collaborate in crusades against Islam and China, but on the basis of common Judeo-Christian values and interests, not through the UN or any kind of binding agreement.
Bannon’s brand of nationalism, of course, helped to bring about the two world wars. It is much more likely that neighboring countries in a nationalist frenzy will fight each other than cooperate in a battle against a remote group of outsiders. Leaving that aside, however, consider the example of Northern Ireland after Brexit: the British, Northern Irish, and Irish governments all deplore the idea of a hard border, but without the involvement of the EU, there doesn’t seem to be any viable way to avoid one. All of the parties in Ireland will suffer needlessly as a result.
Sometimes, international entities and agreements are indispensable, even if Bannon doesn’t understand that.