World leaders arrive at the White House where U.S. President Barack Obama will host his final Nuclear Security Summit dinner. Rough Cut (no reporter narration).
ROUGH CUT (NO REPORTER NARRATION) STORY: World leaders arrived at the White House on Thursday (March 31) where U.S. President Barack Obama was due to host his final Nuclear Security Summit dinner. With less than 10 months left in office to follow through on one of his signature foreign policy initiatives, Obama will convene leaders from more than 50 countries for his fourth and final Summit, a high-level diplomatic process that started and will end on his watch. A boycott by Russian President Vladimir Putin, apparently unwilling to join in a U.S.-dominated gathering at a time of increased tensions between Washington and Moscow, adds to doubts that the meeting will yield major results. The recent deadly militant attacks in Brussels have fueled concern that Islamic State could eventually target nuclear plants and develop radioactive "dirty bombs," a topic that may well be uppermost in leaders' minds as they meet. Despite significant progress by Obama in persuading dozens of countries to rid themselves of bomb-making materials or reduce and safeguard stockpiles, much of the world's plutonium and enriched uranium remains vulnerable to theft. Efforts to make the world safer have also been complicated by North Korea's nuclear weapons advance and Pakistan's move toward smaller, tactical nuclear weapons, which Washington fears may further destabilize an already volatile region.