There's no official family photo on the schedule for this year's G20 summit, an indication of just how much the war in Ukraine has complicated global cooperation efforts. Without directly naming Russia, China's President Xi Jinping said the threat of nuclear weapons was unacceptable. Similarly subtle, Indian PM Narendra Modi called for a ceasefire. In a more open condemnation, Western leaders blamed Russia alone for the war. For more on the summit, geopolitics professor Yves Doutriaux joined us for Perspective.