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

delivery systems

Russian nuclear weapons, 2024

By Hans M. Kristensen, Matt Korda, Eliana Johns, Mackenzie Knight | Nuclear Notebook, Nuclear Weapons

Nuclear weapons sharing, 2023

By Hans M. Kristensen, Matt Korda, Eliana Johns, Mackenzie Knight | Nuclear Notebook, Nuclear Weapons

Pakistan nuclear weapons, 2023

By Hans M. Kristensen, Matt Korda, Eliana Johns | Nuclear Notebook, Nuclear Weapons

Nuclear Notebook: French nuclear weapons, 2023

By Hans M. Kristensen, Matt Korda, Eliana Johns | Nuclear Notebook, Nuclear Weapons

soldiers marching in Red Square, Moscow

Nuclear Notebook: Russian nuclear weapons, 2023

By Hans M. Kristensen, Matt Korda, Eliana Johns | Nuclear Notebook, Nuclear Risk, Nuclear Weapons

Nuclear Notebook: Chinese nuclear weapons, 2023

By Hans M. Kristensen, Matt Korda, Eliana Johns | Nuclear Notebook, Nuclear Risk, Nuclear Weapons

night-time test launch of Minuteman ICBM with silhouettes of crowd

Nuclear Notebook: The long view—Strategic arms control after the New START Treaty

By Jessica Rogers, Matt Korda, Hans M. Kristensen | Nuclear Notebook, Nuclear Risk, Nuclear Weapons

A large suspected enrichment facility has been constructed at the Kahuta complex since 2014.

Nuclear Notebook: How many nuclear weapons does Pakistan have in 2021?

By Hans M. Kristensen, Matt Korda | Nuclear Notebook, Nuclear Risk, Nuclear Weapons

Nuclear submarine HMS Vanguard arrives back at HM Naval Base Clyde, Faslane, Scotland following a patrol. Photo: CPOA(Phot) Tam McDonald/MOD accessed via Wikimedia Commons. Open Government License version 1.0.

Nuclear Notebook: How many nuclear weapons does the United Kingdom have in 2021?

By Hans M. Kristensen, Matt Korda | Nuclear Notebook, Nuclear Risk, Nuclear Weapons

Nuclear Notebook: How many nuclear weapons does Russia have in 2021?

By Hans M. Kristensen, Matt Korda | Nuclear Notebook, Nuclear Weapons

A Russian Topol-M mobile missile at a 2012 parade.

Nuclear Notebook: Russian nuclear forces, 2020

By Hans M. Kristensen, Matt Korda | Nuclear Notebook, Nuclear Risk

Russian nuclear forces, 2019

By Hans M. Kristensen, Matt Korda | Nuclear Notebook, Nuclear Weapons