"The decision to pull out of the Iran deal is the latest example of the administration’s aggressive unilateralism," Financial Times chief foreign affairs commentator Gideon Rachman writes from London (subscription).

The big picture: "America’s allies may harrumph that it is unacceptable for the US to walk away from the Iran deal or the Paris climate accord, but there is not much they can do about it. After all, European allies depend not only on the dollar, but also ... on American military protection."