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.

On October 11, 2018, Harvard Kennedy School Professor of Practice Matthew Bunn presented "For Security's Sake: Saving U.S.-Russian Nuclear Arms Control" at Oak Ridge National Laboratory.

Today, both Russia and the United States are modernizing their nuclear forces to keep these threats robust for decades to come — though their forces’ total numbers are limited by treaties (thank goodness). The U.S. program is expected to cost $1.2 trillion over 30 years, and the Trump administration has added new, smaller nuclear weapons that critics warn might seem more usable should war come. Russia’s program includes entirely new types of strategic weapons, from an intercontinental torpedo designed to blow up U.S. coastal cities to a nuclear-powered and nuclear-armed cruise missile.

The major global nuclear powers are building up their arsenals once again, sparking fears of a new nuclear arms race. How serious is the danger? We ask Matthew Bunn, former White House adviser on Science and Technology Policy and co-principal investigator from the Belfer Centre on Managing the Atom.

Cooperation between U.S. and Russian nuclear scientists and engineers represents an important opportunity for rebuilding U.S.-Russian relations. The United States and Russia possess more than 90 percent of the world’s nuclear weapons, the world’s largest stocks of weapons-usable nuclear material, and the world’s largest nuclear complexes, giving them a special responsibility for nuclear security and preventing nuclear terrorism.

The collapse of the Soviet Union in 1991 created unprecedented dangers. The crumbling empire had thousands of nuclear weapons, enough material to make tens of thousands more, and tens of thousands of experts with sensitive nuclear expertise. To overstate only slightly, Doomed to Cooperate: How American and Russian Scientists Joined Forces to Avert Some of the Greatest Post–Cold War Nuclear Dangers is a true story of scientists and engineers successfully working together to save the world.

No matter how much the world has changed since the Cold War, as other threats like terrorism and global warming have come to dominate our fears, nuclear dangers are still with us. But every day, there are ordinary people collaborating in extraordinary ways to keep the rest of us safe from them. For some, it's a family tradition.

Twenty years ago, in the Clinton Administration, both of us helped launch a program to build a factory to turn the excess plutonium from dismantled nuclear weapons into fuel for nuclear reactors.  At that time, the full life-cycle cost estimate to make this plutonium-uranium mixed oxide (MOX) fuel was expected to be less than $2 billion dollars.  Now, however, with official cost estimates ballooning to over $30 billion, it is clear that the project has become too expensive.  It is time to stop throwing good money after bad and pursue cheaper alternatives that will serve our national security better.