Abe Newman and I have a piece in Vox on Trump’s attempt to pressure allies into spending more on defense. You should ignore the title. The gist of the argument is that, first, there are upsides to having wealthy and technologically advanced allies dependent on the US for their security needs; second, while it would be great to get NATO allies to spend more on defense, this is a very dangerous way to go about doing it; and, third, the benefits of burden-sharing are likely overblown.
Since it went live, I’ve had a few interesting exchanges. One of the claims that we make is that Trump’s calls for burden-sharing are a bit odd. If we want to derive economic benefits from burden-sharing, we need to reallocate defense savings into more productive sectors. Trump’s own plans for military spending suggest he has no intention of doing this. But Raymond Pritchett points out that the alliance has major recapitalization needs—including the SSBN-leg of the nuclear triad—and so some in the Pentagon might hope that burden-sharing allows reallocation.
Regardless, please give it a read.