War, climate, famine... In world beset by turbulence, nations' leaders gather at UN

Facing a complex set of challenges that try humanity as never before, world leaders gather at the United Nations this week under the shadow of Europe’s first major war since World War II — a conflict that has unleashed a global food crisis and divided major powers in a way not seen since the Cold War. FRANCE 24's International Affairs Commentator Douglas Herbert gives his perspective.