Russian nuclear weapons, 2026

Russia is in the late stages of a multi-decade-long modernization program to replace all of its Soviet-era nuclear-capable systems with newer versions. However, this program is facing significant challenges that will further delay the entry into force of these newer systems. In this issue of the Nuclear Notebook, we estimate that Russia now possesses approximately 4,400 nuclear warheads for its strategic and non-strategic nuclear forces—a slight increase from the previous year. The significant increase in non-strategic nuclear weapons that the Pentagon predicted five years ago has so far not materialized. A nuclear weapons storage site in Belarus appears to be nearing completion. The Nuclear Notebook is researched and written by the staff of the Federation of American Scientists’ Nuclear Information Project: director Hans M. Kristensen, associate director Matt Korda, and senior research associates Eliana Johns and Mackenzie Knight-Boyle. To see all previous Nuclear Notebook columns in the Bulletin of the Atomic Scientists dating back to 1987, go to https://thebulletin.org/nuclear-notebook/.