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

strategic nuclear weapons

The US and China re-engage on arms control. What may come next

By Daryl G. Kimball | 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 Putin’s betrayal of Ukraine could trigger nuclear proliferation

By Steven Pifer | Nuclear Weapons, Opinion

skoreamissiles.jpg

A history of US nuclear weapons in South Korea

By Hans M. Kristensen, Robert S. Norris | Nuclear Notebook