United Nations (UN) Secretary-General Ban Ki-moon (C, front) speaks after the UN Security Council adopted a resolution in response to DPRK's fifth nuclear test, at the UN headquarters in New York, the United States, Nov. 30, 2016. The UN Security Council on Wednesday unanimously adopted a resolution to tighten sanctions on the Democratic People's Republic of Korea (DPRK) in response to the country's fifth nuclear test in September. (Xinhua/Li Muzi)