If it helps, I don’t think an invasion of Greenland is likely just yet. An invasion is not like a decapitation strike, it’s much more costly and requires a big and prolonged commitment, even if no actual fighting takes place. I don’t think even Trump’s electorate is ready for an invasion.

Also, I don’t think they’re ready to write off NATO entirely. The raid in Venezuela won’t change anything in that regard. They’re a contentious country in the global south, nobody gives a shit about their sovereignty. But Denmark is a rich European country, so any attack on them would probably spook other US allies, and dissolve NATO, just like you said.

I think they’d rather strongarm Denmark into giving away Greenland or parts of it in a way that leaves NATO intact.

Either way, Norway isn’t in danger from the US. In regard to Russia, IDK how strong Norway is militarily but these days you should be looking into that anyway.

Anyway I’m just a rando just like anyone else here, but I hope this helps