‘We must protect ourselves with respect to China, Russia, and even the United States,” French President Emmanuel Macron said earlier this month, calling for European strategic autonomy from the U.S. That autonomy would, in Mr. Macron’s words, include a “true European army.” A few days later, German chancellor Angela Merkel echoed the call for a European force. The vision is gaining momentum, propelled in part by Donald Trump’s diplomacy of rudeness against America’s European allies.

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