We are witnessing a unique moment of leadership in history. It is not easy to remember a person who would have convulsed the world as much as Ukraine's President Zelenski has done in recent weeks. The events they face are enormous, terrifying. Only a leader in capital letters is capable of confronting them with sufficient capacity to arouse fierce resistance in Ukraine and passionate support in much of the world. He had the possibility of fleeing, as many others have chos