La II Cumbre sobre Seguridad Nuclear, celebrada en Seúl, ha reunido a las potencias mundiales
Leaders of nations and international organisations attending the Nuclear Security Summit pose during a group photo taking session at the Convention and Exhibition Center (COEX) in Seoul March 27, 2012. REUTERS/Larry Downing (SOUTH KOREA - Tags: POLITICS MILITARY)
US President Barack Obama (L) shakes hands with Russia's President Dmitry Medvedev (R) at the start of the first plenary session of the 2012 Nuclear Security Summit at the COEX Center in Seoul on March 27, 2012. Obama told yesterday Medvedev that he had little flexibility to address Russia's objections to a US missile defence shield before his November reelection bid. AFP PHOTO / RIA-NOVOSTI / KREMLIN POOL / MIKHAIL KLIMENTYEV
U.S. President Barack Obama (centre L) shakes hands with Russia's President Dmitry Medvedev (centre R), as South Korea's President Lee Myung-bak (seated) looks on, at a plenary session during the Nuclear Security Summit at the Convention and Exhibition Center (COEX) in Seoul March 27, 2012. REUTERS/Jin Sung-Chul/Yonhap (SOUTH KOREA - Tags: POLITICS MILITARY) NO SALES. NO ARCHIVES. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.