Denmark doesn't have a leg to stand on when it comes to Greenland, because it was among the first to recognize "Kosovo".
It clearly doesn't care about sovereignty and territorial integrity as a principle, but only applies it to some and not the others.
Which sucks when the "other" is you, doesn't it?
Since Copenhagen can't hope to defeat Washington by force, the only thing it can do is make a moral claim. And the only way to do that is to un-recognize "Kosovo."
Din tur!