When the head of a nation at war comes to town, it’s serious business. Ukrainian President Volodymyr Zelensky, having just been in New York at the United Nations General Assembly meeting, is taking a detour to Washington, D.C., before returning home to Kyiv to make one more plea for continued U.S. assistance in his continued battle to control his country from the grasp of Russian President Vladimir Putin. We need to hear him out. In New York, Zelensky warned us. He told the world that “mass destruction is gaining momentum,” and that “the aggressor is weaponizing many other things and...