The authoritative guide to ensuring science and technology make life on Earth better, not worse.

Ukraine

Russia-Belarus nuclear sharing would mirror NATO’s—and worsen Europe’s security

By Nikolai N. Sokov | Nuclear Weapons

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

The A1 Verse: The world’s war machine

By Thomas Gaulkin | Special Topics

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

Heavy equipment in a quarry.

The war in Ukraine is hurting the transition to low-carbon technologies

By Paul Hockenos | Climate Change

young climate activists at cop25

Russia seeks to revoke citizenship from anti-war climate activist

By Andrew Roth | Climate Change

VIDEO – Zelensky’s journey: A standup comic stands up to Putin

By Thomas Gaulkin | Multimedia, Special Topics

A US Marine launches a lethal miniature aerial missile system during an exercise at Marine Corps Base Camp Pendleton, Calif. on Sept. 2, 2020. Credit: Jennessa Davey, US Marine Corps.

Phoenix Ghosts are part drones, part missiles. How does that change combat?

By Dan Gettinger | Disruptive Technologies, Technology and Security

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 Putin’s betrayal of Ukraine could trigger nuclear proliferation

By Steven Pifer | Nuclear Weapons, Opinion

The A1 Verse: The story of horrors

By Thomas Gaulkin | Special Topics

Five reasons that Russia’s nuclear exports will continue, despite sanctions and the Ukraine invasion. But for how long?

By Marina Lorenzini, Francesca Giovannini | Nuclear Energy

A launch of the Russian Iskander-M, which can carry a tactical nuclear warhead, at the Kapustin Yar proving ground in March 2018. Photo credit: the websites (mil.ru, минобороны.рф) of the Ministry of Defence of the Russian Federation. Licensed under the Creative Commons Attribution 4.0.

Potential US responses to the Russian use of non-strategic nuclear weapons in Ukraine

By Jeffrey Edmonds | Nuclear Risk, Nuclear Weapons