So Trump made a new agreement with Denmark about Greenland. It will replace the 1951 one.
What's in the new agreement not sure. If we can believe Trump's "truth" we pretty much can't, it's pure win for the US. There is no official publication of it yet, according to politico:
https://www.politico.com/news/2026/09/18/trump-denmark-greenland-new-security-agreement-01084764
Same article links the the old one:
https://avalon.law.yale.edu/20th_century/den001.asp
Should read sometimes, it's not long.

In my opinion Trump is desperate to bring home a win, since Midterm elections are approaching, and everything looks like a disaster.