Jonathan Cohen (R, front), U.S. Acting Permanent Representative to the United Nations, shakes hands with Russian First Deputy Permanent Representative to the United Nations Dmitry Polyanskiy (C) prior to a Security Council meeting on threats to international peace and security, at the UN headquarters in New York, on Aug. 22, 2019. Russia's deputy UN envoy on Thursday appealed to European countries to heed the United States' recent withdrawal from a Cold War arms control treaty and warned of a possible new arms race. (Xinhua/Li Muzi)