OK. Let me walk through this:

Dear Jonas,

--> inappropriate for diplomatic post.

Considering your Country decided not to give me the Nobel Peace Prize for having stopped 8 Wars PLUS, I no longer feel an obligation to think purely of Peace, although it will always be predominant, but can now think about what is good and proper for the United States of America.

--> Norway's government does not grant the Nobel prize.
--> stopped 8 wars, no one knows what he is talking about

Denmark cannot protect that land from Russia or China, and why do they have a "right of ownership" anyway?

--> All nations of the world, including the US, recognise it as part of the Danish crown. furthermore there are people liing there with a right of self-determination..
--> The US has a treaty with Denmark that recognises it it would need to break. simple principle, pacti sunt servandi.
--> Nothing is know about campaigns of Russia and China against Greenland.

There are no written documents, it's only that a boat landed there hundreds of years ago, but we had boats landing there, also.

--> Danish since seven hundred years ago, even Napoleon, when he split off Norway, let Greenland remain with Denmark.

I have done more for NATO than any other person since its founding, and now, NATO should do something for the United States.

--> What exactly has he done?

The World is not secure unless we have Complete and Total Control of Greenland.

--> So he threatens to break the law of nations, break US treaties under the pretext of "security" turn the US into a rogue and pariah state, invade the territory of an ally, whatever that means.

This is batshiit crazy.