Donald Trump returns to the United Nations this week carrying the weight of a world in visible disarray — military tensions with Iran, an unresolved war in Ukraine, a humanitarian catastrophe in Gaza, and the ungoverned frontier of artificial intelligence all converging in a single assembly hall. He arrives as a leader historically skeptical of multilateral institutions, now asking those same institutions to receive his positions on some of the most consequential questions of the era. The visit is less a diplomatic triumph in the making than a test of whether American leadership and the UN's o