The size of the U.S. nuclear arsenal has decreased drastically since it peaked at 31,255 nuclear weapons in 1967. Many of the reductions since then have come as the result of bilateral arms control agreements with Russia, including the Strategic Arms Reduction Treaty (START) I, which capped deployed arsenals at 6,000 warheads and 1,600 delivery […]
Senior Policy Director Alexandra Bell’s Op-Ed in The Cipher Brief
Read the op-ed here. Imagine the middle of nowhere Alaska. Got that in your head? Great. Now drive 2½ hours further into nowhere and you have arrived at Fort Greeley. I visited in the fall of 2015. It was cold out there—a wet, bitter cold. It’s also slightly eerie. The absolutely enormous ravens all around […]
Fact Sheet: Anti-Ballistic Missile (ABM) Treaty
Updated March 2021 The Anti-Ballistic Missile (ABM) Treaty was an agreement between the United States and the Soviet Union that limited the number of ground-based anti-ballistic missile systems and sites that each side could have. Both parties also agreed not to develop sea-based, air-based, or space-based ABM systems. After the fall of the Soviet Union, […]
Fact Sheet: The Threshold Test Ban Treaty (TTBT)
The Treaty on the Limitation of Underground Nuclear Weapon Tests, commonly known as the Threshold Test Ban Treaty (TTBT), is a bilateral agreement between the United States and Soviet Union (now Russia). Signed in 1974, the Treaty prohibits underground nuclear weapons tests greater than 150 kilotons, approximately 10 times larger than the bomb used against […]
Executive Director John Tierney’s Op-Ed in Huffington Post
Read the full piece in the Huffington Post here. No analysis of the Trump Presidency’s First 100 days would be complete without reviewing how his administration has handled the United States’ most immediate existential threat – nuclear weapons. Mitigating the threat of nuclear weapons and their spread is integral to the safety and security of […]



