Donald Trump does not think strategically. Nor does he think historically, geographically, or even rationally. He does not connect actions he takes on one day to events that occur weeks later. He does not think about how his behavior in one place will change the behavior of other people in other places.
He does not consider the wider implications of his decisions. He does not take responsibility when these decisions go wrong. Instead, he acts on whim and impulse, and when he changes his mind—when he feels new whims and new impulses—he simply lies about whatever he said or did before…
…If allied leaders thought that their sacrifice might count for something in Washington, they might choose differently. But most of them have stopped trying to find the hidden logic behind Trump’s actions, and they understand that any contribution they make will count for nothing. A few days or weeks later, Trump will not even remember that it happened.