U.S. Ambassador to the United Nations Nikki Haley (L, Front) speaks at a Security Council meeting at the UN headquarters in New York, on Sept. 6, 2018. UN Under-Secretary-General for Disarmament Affairs Izumi Nakamitsu on Thursday asked the Security Council to find a common approach to tackle the issue of lack of accountability for the use of chemical weapons in Syria. (Xinhua/Li Muzi)