FILE - United States Ambassador and Representative to the United Nations Linda Thomas-Greenfield addresses members of the U.N. Security Council before voting during a meeting on Non-proliferation of nuclear weapons, Wednesday, April 24, 2024, at United Nations headquarters. The United States on Monday, April 29, implored all countries supplying weapons to Sudan’s warring parties to halt arms sales, warning that history in the vast western Darfur region where there was a genocide 20 years ago “is repeating itself.” Thomas-Greenfield told reporters after an emergency closed meeting of the U.N. Security Council that El Fasher, the only capital in Darfur not held by paramilitary forces, is “on the precipice of a large-scale massacre.” (AP Photo/Eduardo Munoz Alvarez, File)