Can you explain to me how it is weird? Months ago, the US was an ally of Denmark and Greenland. Greenland allowed an ally to have their military stationed ther

Can you explain to me how it is weird? Months ago, the US was an ally of Denmark and Greenland. Greenland allowed an ally to have their military stationed there, because it served both (through NATO). From one day to the other, the US behave like an enemy. And the US behave erratically. So NATO still exists on the paper because the US haven't invaded anyone yet, but the US are behaving like enemies and threaten to invade. Seems more than rational, from the point of view of the rest of NATO, to prepare for an invasion, but at the same time hope that NATO still exists and that the US are not actually an enemy (probably not an ally anymore, but "partner" is better than "enemy"). Or am I missing something?