The International Atomic Energy Agency released its “final assessment” yesterday of the possible military dimensions of Iran’s nuclear program.

In the lead-up to the nuclear security summit, Advancing Nuclear Security: Evaluating Progress and Setting New Goals outlines what was accomplished in a four-year effort launched in 2009 to secure nuclear material around the globe—and what remains to be done. The effort made significant progress, but some weapons-usable nuclear materials still remain “dangerously vulnerable." The authors highlight the continuing danger of nuclear and radiological terrorism and call for urgent action.

The 2011 “U.S. - Russia Joint Threat Assessment” offered both specific conclusions about the nature of the threat and general observations about how it might be addressed. This report builds on that foundation and analyzes the existing framework for action, cites gaps and deficiencies, and makes specific recommendations for improvement.

On the eve of the Nuclear Security Summit in Seoul, South Korea, a new study finds that an international initiative to secure all vulnerable nuclear stockpiles within four years has reduced the dangers they pose.

Matthew Bunn and Martin B. Malin examine the conditions needed for nuclear energy to grow on a scale large enough for it to be a significant part of the world’s response to climate change. They consider the safety, security, nonproliferation, and waste management risks associated with such growth and recommend approaches to managing these risks. Bunn and Malin argue that although technological solutions may contribute to nuclear expansion in the coming decades, in the near term, creating the conditions for large-scale nuclear energy growth will require major international institutional innovation.