This week, President Barack Obama and 50 world leaders will convene for the fourth and final time to discuss how to prevent nuclear materials from falling into the hands of terrorists. This last gathering of the biannual Nuclear Security Summits comes at a particularly poignant moment, given what we know now about the Brussels terrorists’ interest in targeting nuclear facilities. For better or worse, the summits represent a more ad hoc approach to securing nuclear materials in particular, and advancing global cooperation on transnational threats in general. 

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