Zhang Kejian, director of China Atomic Energy Authority, speaks during an International Atomic Energy Agency (IAEA) ministerial conference on nuclear security in Vienna, Austria, Feb. 10, 2020. Ministers and other high-level representatives from over 130 International Atomic Energy Agency (IAEA) member states adopted a declaration at a major conference here Monday to enhance global nuclear security and counter the threat of nuclear terrorism and other malicious acts. (Photo by Song Gongbao/Xinhua)
