The European Union is good at coming up with inoffensive-sounding terminology to talk about unpleasant things. For example, the phrase “strategic autonomy” is a nice way of saying, “We don’t trust the Americans” — and, with Donald Trump leading the polls and boasting about encouraging Vladimir Putin to invade European countries, it is impossible to blame them. It is important to get the context of Trump’s remarks straight: Trump says he told an unidentified NATO counterpart whose country hadn’t met the organization’s target for defense spending, “No, I would not protect you. In fact, I would encourage [Russia] to do...