*All numbers are approximate estimates and further described in the Nuclear Notebook (bos.sagepub.com/cgi/collection/nuclearnotebook) in the Bulletin of the Atomic Scientists, and the nuclear appendix in the SIPRI Yearbook (www.sipri.org/contents/publications/yearbooks.html). See also status and 10-year projection (fas.org/programs/ssp/nukes/publications1/TrimmingNuclearExcess.pdf) of U.S. and Russian forces. Additional reports are published on the FAS Strategic Security Blog (fas.org/blog/ssp/category/hans_kristensen).
Current update: April 28, 2015.