The United States and Israel have clashed with Iran at an emergency meeting of the U.N. Security Council, where the U.N. chief and many countries urged a halt to their attacks and a return to negotiations. Secretary-General António Guterres told the council on Saturday that everything must be done to prevent the conflict from spreading further into the region and beyond. Guterres also condemned Iran’s retaliatory attacks. The U.S. ambassador to the United Nations, Mike Waltz, insisted the U.S. military action was lawful. Israel’s U.N. Ambassador Danny Danon also defended the airstrikes, saying they were necessary to stop an existential threat.