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U.N. Secretary-General António Guterres, center, speaks at the signing ceremony for the Treaty on the Prohibition of Nuclear Weapons Sept. 20. (U.N. photo/Kim Haughton)
U.N. Secretary-General António Guterres, center, speaks at the signing ceremony for the Treaty on the Prohibition of Nuclear Weapons Sept. 20. (U.N. photo/Kim Haughton)