United Nations Secretary-General Antonio Guterres (Front) attends the commemorative event during the 73rd anniversary of the U.S. atomic bombing of Nagasaki City in Nagasaki City, Japan, on Aug. 9, 2018. Nagasaki City in Japan commemorated the 73rd anniversary of the U.S. atomic bombing on Thursday, with its mayor urging the Japanese government to support an international nuclear ban treaty which came into effect last year. (Xinhua/Ma Ping)