Status of World Nuclear Forces 2012
*All numbers are estimates and further described in the Nuclear Notebook in the Bulletin of the Atomic Scientists, and the nuclear appendix in the SIPRI Yearbook. Additional reports are published on the FAS Strategic Security Blog. Unlike those publications, this table is updated continuously as new information becomes available. Current update: March 6, 2012.
Details here: Federation of American Scientists :: Status of World Nuclear Forces
Their are some interesting observations here.
- Nuclear arsenal of Israel is lesser in quantity then those of Pakistan and India. But Israel is prepared to increase the quantity of its nuclear weapons to 200, if the need arises.
- China, Israel, Pakistan, India, and North Korea have not actually 'deployed' their nuclear arsenal on 24/7 basis. This indicates 'no first use policy' for these countries? Their can be additional reasons though.