If Denmark doesn't want to be affiliated with Greenland, they have just as much right to end the relationship. I don't see why Denmark couldn't "sell" whatever it is that they do have of Greenland. Whatever arrangements Denmark has with Greenland for its administration and governance, in the international scheme of things, it belongs to Denmark. If the Greenlanders want to remain Danes and not become part of the US, they can move.
Greenland gets to say who owns it when they have a military and foreign ministry or state department.
“Tolerance is the virtue of the man without convictions.” GK Chesteron
Inde muagdhe Aes Sedai misain ye!
Deus Vult!
*MySmiley*