Nuclear security around the world has improved dramatically over the last three decades—which demonstrates that with focused leadership, major progress is possible. But important weaknesses remain, and the evolution of the threat remains unpredictable. The danger that terrorists could get and use a nuclear bomb, or sabotage a major nuclear facility, or spread dangerous radioactive material in a “dirty bomb,” remains too high. The United States and countries around the world need to join together and provide the leadership and resources needed to put global nuclear security on a sustained path of continuous improvement, in the never-ending search for excellence in performance.

"Today and tomorrow, world leaders will gather for what will likely be the final international summit on security for nuclear weapons and the materials needed to make them—a key tool for preventing nuclear terrorism. The last time this group met, at the 2014 Nuclear Security Summit in the Hague, they declared that preventing terrorists from acquiring nuclear weapons or weapons-usable materials remained “one of the most important challenges in the years to come.” Yet, since then, nuclear security has improved only marginally, while the capabilities of some terrorist groups, particularly the Islamic State, have grown dramatically, suggesting that in the net, the risk of nuclear terrorism may be higher than it was two years ago..."

"As world leaders gather for the fourth nuclear security summit this week, in the aftermath of the horrifying terrorist attacks in Brussels, it seems likely that Belgian Prime Minister Charles Michel will have more to say than anyone else — both about real nuclear terrorist dangers and about real steps taken to improve nuclear security...."

"World leaders face a stark choice at the final Nuclear Security Summit later this week: Will they commit to efforts that continue to improve security for nuclear weapons, fissile materials, and nuclear facilities, or will the 2016 summit be seen in retrospect as the point at which attention drifted elsewhere, and nuclear security stalled and began to decline? The answer will shape the chances that terrorist groups, including the Islamic State, could get their hands on the materials they need to build a crude nuclear bomb...."

In this new report, Preventing Nuclear Terrorism: Continuous Improvement or Dangerous Decline?, Matthew Bunn, Martin Malin, Nickolas Roth, and William Tobey provide a global reality check on nuclear security. They note that effective and sustainable nuclear security capable of addressing plausible threats is the single most effective chokepoint preventing terrorists from acquiring a nuclear weapon.

William H. Tobey, Matthew Bunn, and Nickolas Roth oppose proposed legislation that would prohibit funding for fixed radiation detectors to catch nuclear smugglers. They argue for a balanced program to defeat nuclear smuggling that includes strong security, effective law enforcement and intelligence work, and interdiction efforts and border controls backed by both fixed and mobile radiation detectors.

"In the dark days at the turn of the year, all but a few bits of U.S.-Russian cooperation to strengthen nuclear security in Russia came to a halt.  No longer, for now at least, will U.S. experts work with counterparts at major Russian nuclear facilities to implement better means to prevent insiders from stealing fissile material, or to improve accounting, so a theft would be quickly detected..."

On October 15, 2014, Matthew Bunn presented "Strengthening Nuclear Security Through Bilateral Cooperation: What Next?" for the Stanley Foundation "Strategy for Peace" Conference in Washington, D.C.

On September 26, 2014, Matthew Bunn presented "Nuclear Security in Russia – and Current State of Cooperation" at the Harvard Workshop on Nuclear Security at the U.S. Institute for Peace.

In this op-ed for the International New York Times, William H. Tobey, Matthew Bunn, and Nickolas Roth make the case for continuing nuclear security cooperation with Russia and continuing to fund international nuclear security efforts.