I think that if every non-US NATO country put boots on the ground in Greenland, Trump would stay the fuck away. He is a coward - he knows that if the rest of us stand together, it would be an ugly fight that would benefit no one. On the other hand, the only way the US wins cleanly in Greenland is if we fail to stand together. It would be good training too, but I think sending (a few of) our troops to Greenland could prevent the war.