Don’t let them in. Simple as
I think that they can’t deny access to the US military bases in Greenland.
They can keep them from leaving the base
They can also order the US to remove the base entirely, which they should have done the moment Trump started joking about war.
How is everyone not fucking getting this? Trump and his gaggle of dunning-kruger fucksticks DO NOT control the US military. All they’ve done is replace the executive leadership. The lifelong military brass are still the same, and any order to invade the EU or Canada would result in widespread refusal of orders and is far more likely to result in a US domestic civil war than WW3. This “upper hand” will not be permanent.
The correct response is to call their bluff, tell them to get fucked, and aggressively cancel all trade and agreements that benefit the US.
Trump will certainly refuse to remove the base and use any attempt by Greenland to do so as pretext for an attack.
He desperately wants this excuse, as it provides enough legitimacy for him to convince ~50% of the US population.
Greenland and Denmark are most likely aware of this and act accordingly. I don’t know what current preparations are but I wouldn’t be surprised if they built up defenses against the US right now.
Do like they do in America. Throw them in a cell for 72 hours without any legal representation and then ship them to Venezuela while forcing them to sign documents saying they are gang members. Solved.
Ship them to El Salvador, but yeah.
