emptywheelHere's how I read that Greenland thing:
Greenland: Oh, hey! We had to rescue an American from that submarine you've got lurking 7 nautical miles offshore, who faced an urgent medical crisis.
Trump, caught patrolling an ally: EMergency! I'll send a sick boat that's in the sick bay.
Here's one of the first announcements of the rescue I saw.
It seems the reason you announce this is for maximal embarrassment.
Tl;dr: Greenland announced this to humiliate Trump.
In response, Trump posted a bullshit post, and most American outlets and far far far far too many people On Here posted it as if it had truth value.