well they have not invaded anything yet and i doubt that there will ever be an invasion regardless.  but even i think that greenland would have been much better off with the us rather than denmark. denmark dont have any way to protect it alone from russia or china or both.  and lets be honest here. china and russia want greenland. so it is basically one day either gonna be a part of russia/china or both, or the us. and then the question is who do you want to have control of it? at the top of it all it also give a lot more security for us here in europe also. the us wil be protecting that part and we don't have to think about threats up in that region of the world. i doubt that greenland will ever become a part of the us, but i think it would have been way better off with the us. it's not like denmark has done much for greenland anyway. and greenland can never become independent because they are dependent on funding from denmark as of today, or the us. lot's of resources on greenland, and denmark is not taking advantage of it, probably because of green politics. the us def will take care of that problem, and personally i dont see a negative part with being able to do business with the us on commodities or natural resources versus russia or china.
Norway