The only way to accomplish this at scale is to build something that is legit better and let the market decide. Anything else is just principled wishful thinking.
It's hardly rhetoric, from the European perspective. The EU is already embroiled in a proxy war against a major power in Ukraine, and are now faced with the prospect of their strongest erstwhile ally moving to annex EU territory.
Simultaneous war on two fronts, where one opponent is deeply embedded in your supply chains, is an existential threat.
It’s not a completely bonkers idea that the US could purchase all or some of Greenland. In the end, we’ll probably just see a strengthening or enforcement of the existing treaty for US military use of Greenland which is all the US wanted. Europe is still getting used to the president’s rather unique, and yes aggressive, negotiation style born out of his NYC real estate developer days.
This is what someone would say if they only know Donald Trump from TV.
Everyone who knows Trump from his NYC real estate days knows that he's (and this is possibly the worst insult any New Yorker can hurl at someone) "a bum." There's a reason NYC would never vote for him.
He doesn't pay his contractors, reneges on legal agreements he himself created, and uses legal threats and fights to screw over anyone he pleases, especially if they can't afford the legal fight. It's a lie-cheat-steal mentality, and might makes right.
It's not like, some hard-nosed NYC negotiating strategy. He's a crook. There's really not much more than that.