The important part is that Trump has made it acceptable to ignore previous agreements whenever.

So tomorrow, Denmark can scrap the agreement and say, "Art of the deal."

The word of the US now means nothing.

To become permanent and part of the US constitution a treaty must be ratified by the Senate.

Well you also have to remember that Trump and many in his circle are sadistic toddlers who don't actually care about laws, treaties, morality, or even common sense.

under the Military Code and under general law, no military officer can obey an order that is not legal. Basically, it completely prevents Trump from issuing a legal order to invade Greenland.

Nothing is stopping him from issuing an illegal order and his generals would be in more hot water by disobeying it than obeying it.

Any military is purpose built to remove individual autonomy. The ones who rise to the top are the ones who most believe in the chain of command. The idea that one of our generals (who have been purged during Trump's second term) would disobey an order is laughable to me. Maybe every modern president has used the military in a way that is illegal according to US law, a treaty, or both.

The new agreement also prohibits foreign adversaries of the U.S., like Russia and China, from establishing bases on Greenland.

I assume the U.S. gets to unilaterally decide who their adversaries are. Will that include us soon, if it doesn't already?

A narcissist was pacified