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North Korea launched what is presumed to be a banned intercontinental ballistic missile on Thursday, marking an “end to its self-imposed moratorium on nuclear and long-range missile testing.”

Science for a safer, more informed world.

Vladimir Putin has placed Russias nuclear forces on "special alert", a move that UN Secretary General António Guterres has described as a "chilling development".

Russia’s war against Ukraine entered its 4th day, with much of the globe rallying behind Ukraine’s strong resistance. Still, President Putin waved a nuclear saber this morning, as the two sides plan talks.

This issue of the Nuclear Notebook examines Israel’s nuclear arsenal, which we estimate includes a stockpile of roughly 90 warheads. Israel neither officially confirms nor denies that it possesses nuclear weapons, and our estimate is therefore largely based on calculations of Israel’s stockpile of weapon-grade plutonium and its inventory of operational nuclear-capable delivery systems.

This Nuclear Notebook examines China’s nuclear arsenal, which has now surpassed France’s as the world’s third largest. The authors estimate that China's stockpile now includes roughly 350 operational warheads with more in production. The stockpile is projected to increase further in the next decade but remains significantly smaller than that of Russia or the United States.

Bulletin Virtual Program May 27, 2021 12-1 p.m. CDT | 1-2 p.m. EDT Join the Federation of American Scientists’ Hans Kristensen and MIT’s Heather Williams in conversation with The Guardian’s Julian Borger to discuss the United Kingdom’s decision to increase its nuclear stockpile limit. Hear how that choice fits into global trends towards nuclear modernization but also what can be done to keep on the path of disarmament. Speakers Hans Kristensen Hans Kristensen is the director of the N...

Russias Tu-95 Bombers Are Old School, But Still Killing This bomber is important to Russias strategic forces. It might still be propeller-driven, but dont let that fool you. Heres What You Need to Remember: What’s interesting about the Tu-95MSM modernization is that it represents a slow downsizing of the Russian strategic bomber fleet. Both the BAS and popular Russian sources have suggested that the MSM upgrade will not be applied to the entire current Tu-95MS fleet. The Tu-95 is one of the...

https://thebulletin.org/wp-content/uploads/2021/04/Vanguard_at_Faslane_04-featured-image-150x150.jpg Editor’s note: The Nuclear Notebook is researched and written by Hans M. Kristensen, director of the Nuclear Information Project with the Federation of American Scientists, and Matt Korda, a research associate with the project. The Nuclear Notebook column has been published in the Bulletin of the Atomic Scientists since 1987. To download a free PDF of this article, click here. To see all prev...

Nuclear Notebook: How many nuclear weapons does Russia have in 2021? Bulletin of the Atomic Scientists, By Hans M. Kristensen, Matt Korda, March 15, 2021    T his is a very long article.  Some introductory bits: Russia is in the middle of a decades-long modernization of its strategic and nonstrategic nuclear forces to replace Soviet-era weapons with newer systems……… Putin also noted his disappointment with the “deterioration” of the US-Russia arms control regime, and de...