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U.S. Ambassador to the United Nations Nikki Haley (R, Front) and British Ambassador to the UN Karen Pierce (L, Front) vote in favor of a U.S.-drafted resolution on probe of chemical weapons use in Syria at the UN headquarters in New York, April 10, 2018. Russia vetoed a U.S.-drafted Security Council resolution on probe of chemical weapons use in Syria on Tuesday. (Xinhua/Li Muzi)