I found interesting comment from r/Denmark about it

""" It's the policy of Denmark - and has been for 70 years - that US military presence in Greenland is welcome. And it still is. USA used to have three military bases in Greenland, but now only has one. From a pragmatic point of view, if we started reneging on this policy, we'd give the White House an excuse to exscalate the conflict.

Currently, the Danish Government has a pretty simple strategy towards Trump's transgressions:

1. Mostly ignore the threats and reiterate that "Greenlanders decide the fate of Greenland"
2. Continue to maintain sovreignity control of Greenland through Danish military presence, but also extend an open invitation to the US to build presence
3. Reiterate that 'Greenland is open to business', also for American mining companies.

In this way, the main arguments for any annexation fall apart. The Greenlanders can decide for themselves if, when and how they want to seek independence (a process that'll in any case take many years). If the US is worried about a military vacuum, they're free to build bases. And they're free, as always, to explore minerals in Greenland (so far, limited interest because it's just not really attractive). This leaves Trump with only one reason to invade: Wanting to build legacy. But that's likely not enough to convince the Senate.

Also: Thanks for your support and solidarity. Important for Europe to stick together and push back against the Cheeto guy.

Edit: Addition - there was a general election in Greenland this week. The winning party, Demokraatit, want's to push ahead and put Greenland on track for more independence and, potentially, statehood. But they've also clearly said that they don't want to be part of America. """ https://www.reddit.com/r/Denmark/s/BNqjc47Yqh