They have to understand that they are more or less allowing Trump to set everything on fire. Every single one of US allies at this point hate him. He has alienated Canada, and all of Europe. He’s destabilizing NATO, and therefore the entire foundation of western democracy and defense. I doubt Australians, the Japanese, or any other established country is particularly fond of him either, or they won’t be, when he sets his sights on them.

Long-term this is a massive shot in the foot. He may be able to throw his weight around in a cage like a gorilla right now, but as allies slowly realize that the US can fundementally no longer be trusted, that cage is going to shrink. In the coming years we will likely see massive military escalation across all non-US western nations, and EU as a whole are already making moves to pull ressources out of the US.

Now that France actually is deployed in Greenland, annexation would mean instigating war with a nation with atomic weapons. Not to mention that the whole exercise is pointless - the US have always had the right to deploy in Greenland, they have always been able to establish a military presence. In fact, if he wants the golden dome there, there is an established procedure he has to follow, which historically hasn’t been a problem.

Denmark has done so much shit for the US through the years. We allowed them to hide nuclear missiles in the ice during project iceworm. They never cleaned up after themselves, and now Greenland has a nuclear hazard. We even forcibly removed a whole people, the entire city of Thule (Uummannaq), because the US wanted a huge fucking base right where they lived. Guess who paid for those reparations 40 years later to compensate the Inuits who had their entire livelihood and home destroyed? Denmark did.

To top it off, there literally is no threat there right now. Not from the Russians. Not from the Chinese. The only threat is Trump. Yes, the Russians are trying to sabotage infrastructure, and the Chinese are trying to make investments. But NATO has pretty much been able to handle that.