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 associ-ate with the project. The Nuclear Notebook column has been published in the Bulletin of the Atomic Scientists since 1987. This issue’s column examines Russia’s nuclear arsenal, which includes a stockpile of nerarly 4,500 warheads. Of these, some 1,600 strategic warheads are deployed on ballistic missiles and at heavy bomber bases, while an additional 985 strategic warheads, along with 1,912 nonstrategic warheads, are held in reserve. The Russian arsenal is continuing broad modernization intended to replace most Soviet-era weapons by the mid- to late 2020s. To see all previous Nuclear Notebook columns, go to https://thebulletin.org/nuclear-risk/nuclear-weapons /nuclear-notebook/

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