World Leaders Gather For Nuclear Security Summit 2014

THE HAGUE, NETHERLANDS - MARCH 24: US President Barack Obama shakes hands with Prime Minister of the Netherlands Mark Rutte at the World Forum Convention Center ahead of 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 Freek van den Bergh - Pool/Getty Images)