India and Pakistan exchanged a list of each other's nuclear installations on Saturday like they have done at the start of each year under a 1988 pact in which the two sides agreed not to attack these facilities. That is the main confidence building measure in the area of nuclear security between the two countries, even though their nuclear weapons programmes have expanded significantly since then. Indeed for some years now there is a growing body of international opinion that holds that Pakistan has stepped up production of fissile material, and may just possibly hold more nuclear weapons than its much larger rival, India.
Which is remarkable given that the Indian nuclear programme is driven by the need for deterrence against much bigger armed-China, the third element in the South Asian nuclear tangle. The Indians who conducted a nuclear test as early as 1974, thus,may be behind not just the Chinese, but also Pakistan in terms of the number of warheads, fissile material and delivery systems.
The Bulletin of Atomic Scientists in a global report in August 2010 estimated that India had assembled 60 to 80 warheads and produced enough fissile material for 60-105 nuclear warheads. Pakistan is estimated to have assembled 70–90 warheads and produced missile material for as many as 90 warheads. China's arsenal was estimated at 240 nuclear warheads. Here's a PDF of the report prepared by Robert S.Norris and Hans M.Kristensen.
The majority of India’s and Pakistan’s warheads are not yet operationally deployed, the researchers said. Both countries are believed to be increasing their stockpiles although the competition is nowhere near the intensity of the race between the United States and Russia during the Cold War. Indeed even today the combined total of Indian and Pakistan warheads will only be slightly more than the number carried by a single U.S. Trident submarine.
Nevertheless the race to expand nuclear weapons programme as also missile development adds another layer of instability in South Asia, with Afghanistan and Pakistan at the centre of the turmoil and home to al Qaedaand allied militant groups. The question is why now ? Why is Pakistan seeking to expand its arsenal ? Is this a numbers game ? Are the rivals getting sucked into a nuclear arms race without intending to ?