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US President Bill Clinton, Russian President Boris, Yeltsin, and Ukrainian President Leonid Kravchuk sign the Trilateral Agreement on transferring nuclear weapons from Ukraine to Russia and associated matters in Moscow, January 1994. Photo credit: Joseph P. Harahan, historian of the Defense Threat Reduction Agency, and the Clinton Presidential Library.

Why security assurances are losing their clout as a nuclear nonproliferation instrument

By Ariel E. Levite | Nuclear Weapons

illustration of chess pieces made of flags of the nine nuclear weapons states falling over with Ukrainian flag in the background

Has the Russia-Ukraine war blown up the global nuclear order?

By Lauren Sukin | Nuclear Risk, Nuclear Weapons

If Ukraine chooses neutrality, what could that look like?

By Mariana Budjeryn | Nuclear Risk, Opinion

Tacit rules to avoid a NATO-Russia war

By Steven Pifer | Nuclear Risk, Nuclear Weapons, Opinion

Bulletin Science and Security Board condemns Russian invasion of Ukraine; Doomsday Clock stays at 100 seconds to midnight

By Bulletin Science and Security Board | Announcement, Doomsday Clock, Nuclear Risk

Representatives to the Biological Weapons Convention meet.

Don’t let finger-pointing doom this key treaty against bioweapons

By Filippa Lentzos, Jez Littlewood | Biosecurity

Russia launches invasion of Ukraine - Putin's troops 'seize control' of Chernobyl nuclear disaster site. Source: Sky News. https://news.sky.com/story/russia-launches-invasion-of-ukraine-forces-trying-to-seize-site-of-chernobyl-nuclear-disaster-12550026

Russia’s invasion of Ukraine invalidates key international relations assumptions

By François Diaz-Maurin | Nuclear Risk, Nuclear Weapons, Opinion

A Ukrainian serviceman pets his dog at a frontline position outside of Novaluhansâke, Ukraine on Tuesday. (Photo by Wolfgang Schwan/Anadolu Agency via Getty Images)

In a historic moment, the West cannot look away from Ukraine

By Thomas Graham, Jr. | Nuclear Risk, Nuclear Weapons

Russian military pilot in 2016. Credit: Министерство обороны Российской Федерации. License CC BY 4.0. Accessed via Wikimedia Commons.

Russia threatened a “military-technical” response for unmet demands. What could that mean?

By Pavel Podvig | Nuclear Risk, Nuclear Weapons, Opinion

parachute training

A new transatlantic division of labor could save billions every year!

By Barry R. Posen | Analysis, Missile Defense

An F-35A Lightning II Joint Strike Fighter from the 58th Fighter Squadron, 33rd Fighter Wing, at Eglin AFB in Florida. US Air Force photo by Master Sgt. Donald R. Allen

Introduction: Can we make overspending on the military politically costly?

By John Mecklin | Uncategorized

A test version of the new B61-12 guided nuclear bomb to be deployed in Europe as part of a modernization program. Photo from a video by Air Force Staff Sgt. Cody Griffith.

Do Germany and the Netherlands want to say goodbye to US nuclear weapons?

By Michal Smetana, Michal Onderco, Tom Etienne | Nuclear Risk, Nuclear Weapons