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THE HAGUE, NETHERLANDS - MARCH 24: Russian Foreign Minister Sergey Lavrov attends a press conference at the 2014 Nuclear Security Summit on March 24, 2014 in The Hague, Netherlands. The Nuclear Security Summit, held March 24-25, will be attended by world leaders and is aimed at preventing nuclear terrorism. (Photo by Evert-Jan Daniels - Pool/Getty Images)

THE HAGUE, NETHERLANDS - MARCH 24:  Russian Foreign Minister Sergey Lavrov attends a press conference at the 2014 Nuclear Security Summit on March 24, 2014 in The Hague, Netherlands. The Nuclear Security Summit, held March 24-25, will be attended by world leaders and is aimed at preventing nuclear terrorism. (Photo by Evert-Jan Daniels - Pool/Getty Images)