Will some foreign nation just come and pop our president? This is apparently a thing they’re allowed to do now.

I wonder if Putin has put Trump in overdrive, because Putin is panicking?
If Trump/USA invades Greenland it would most likely be the end of NATO, and it would be the end of Europe buying weapons from USA for Ukraine.
USA already had all the access to Greenland they wanted until Trump started this nonsense.
There is no rational reason for Trump to want Greenland, except to destroy NATO! Which he hinted at numerous times already in his first presidency.
From that perspective disrupting Venezuelan oil also makes sense, because China buys oil from Venezuela, without that oil China may have to buy more oil from Russia and pay more than they do currently where China gets Russian oil at a very steep discount.

The actions of Trump seem designed to help Putin, and my guess is that Putin is the designer.