A MacArthur-supported report from the Belfer Center for Science and International Affairs examines a 17-year, $150 million operation to secure plutonium in the tunnels of Degelen Mountain in Kazakhstan, greating reducing one of the greatest nuclear security threats since the collapse of the Soviet Union. The report distills lessons from the operation, which was completed in 2012, for future efforts to reduce and ultimately eliminate the threat posed by nuclear materials.

International Peace & Security, Peace & Security