In February, the Pentagon released a new Nuclear Posture Review (NPR), a comprehensive overview of the nation’s nuclear forces, their disposition, and plans for the future. Here, Belfer Center experts share their assessments of this NPR and the future of America’s nuclear capabilities.

To ministers and heads of state, he was a sought-after adviser, pointing the way toward reforms that boosted farm yields, educational standards, and economic prosperity. To the scientific community, he was an unstinting champion of innovation and rigorous evidence. To his students, he was a passionate teacher and mentor. To thousands of his fans on social media, he was a fount of insight, optimism, and good humor. To us, he was a dear friend and extraordinary colleague.

Matthew Bunn, Nicholas Burns, Ash Carter, John Park, Gary Samore, and Elizabeth Sherwood-Randall provide expert analysis on nuclear tests and threats from North Korea.

"CSIA's research on cooperative denuclearization began during the August 1991 putsch against Mikhail Gorbachev. To those of us familiar with nuclear weapons, their construction, and command and control, and with the looming revolution about to sweep the then–Soviet Union, it was plain that a new and unprecedented danger to international security was emerging. An appropriate policy response to this new form of nuclear threat could not be fashioned from traditional Cold War tools of deterrence, arms control, and military preparedness alone. Safety could only be sought through new policies emphasizing cooperative engagement with the new states, new leaders, and military and industrial heirs of the former Soviet Union...."

Book by Ashton B. Carter, Kurt M. Campbell, Steven E. Miller, and Charles Zraket