U.S. Ambassador to the United Nations Nikki Haley (Front) addresses a Security Council emergency meeting regarding accusations of the use of a nerve agent in the United Kingdom at the United Nations headquarters in New York, on March 14, 2018. Russian Ambassador to the United Nations Vassily Nebenzia said Wednesday that Britain's allegations that Moscow was responsible for a nerve attack were "completely unacceptable." (Xinhua/Li Muzi)