
United Nations Secretary-General Ban Ki-moon speaks during a ceremony to mark the International Day of Peace, at the UN headquarters in New York, the United States, Sept. 21, 2015. (Xinhua/UN Photo/Rick Bajornas)

United Nations Secretary-General Ban Ki-moon speaks during a ceremony to mark the International Day of Peace, at the UN headquarters in New York, the United States, Sept. 21, 2015. (Xinhua/UN Photo/Rick Bajornas)