The truth was written all over the Ukrainian president Volodymyr Zelenskyy’s face in the Oval Office last week. The US is an unreliable ally. “The Trump administration seems unlikely to provide Ukraine with an adequate security guarantee even as it is demanding the ability to rinse Ukraine for its resources, and on Tuesday “paused” all military aid. European leaders are quickly and rightly losing faith in the Nato mutual security guarantee. America has threatened to annex allies including Canada and Greenland. Administration cronies like Elon Musk are now openly musing about the US withdrawing not just from Nato but from...