Trump’s threats against US allies and partners encourage them to consider nuclear weapons. This strikes me as painfully obvious, even though we keep saying we don’t want allies to nuke up. I just wrote about this at 1945 magazine. Please got there for the full argument.

Post-Greenland, I don’t know why US allies would trust us. For two months, we were openly discussing the possibility of using force against a long-standing partner. It is hard to over-emphasize how crazy and self-defeating that it is. Trump has threatened Canada, Mexico, and Panama. When MAGA got drunk on US power right after we kidnapped Maduro, I saw Jesse Waters on Fox say we take Bermuda.

We seem to expect that even as we break the rules of the liberal community of states, other liberal states will not. We get to tariff and bully our allies, and they are just supposed to take it smiling.

That can work for a little while. US allies are asymmetrically dependent on US security guarantees and market access. They are vulnerable to our bullying, because they never thought we would bully them.

But they won’t put up with that forever. Late last year, pre-Greenland, my friend Paul Poast and I argued in Foreign Affairs that US allies would eventually defect. If anything, events suggest our analysis was too easy on Trump. Neither of us expected that the US would actually openly menace an ally.

But here we are. If you are a US ally today, it is hard now to believe – as I say on Twitter – that the US would fight for you, and impossible to believe we would use nuclear weapons for you. In fact, we might attack you instead. So it makes sense to consider your own coverage, because they American nuclear umbrella is gone.

I argued this a year ago for South Korea – that it should nuke. If anything, the ensuing year has made that argument even stronger.