Some American experts say India has around 60 nuclear warheads and Pakistan about 40.
The atomic scientists estimate that India has about 30-35 nuclear warheads, which is fewer than Pakistan.
The collapse of the Soviet Union left 3, 400 nuclear warheads in Ukraine, Kazakhstan and Belarus.
The Navy has four submarines based at Faslane which carry Trident missiles armed with nuclear warheads.
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The US has now disclosed that it is holding 5113 nuclear warheads, a secret figure until now.
Both America and Russia still have far more nuclear warheads than either wants.
Start II would have reduced each side's nuclear warheads to about 3, 000 each.
Both sides have short and medium-range ballistic missiles which could deliver nuclear warheads.
The Defense Intelligence Agency recently testified to Congress that North Korea may now have nuclear warheads deliverable by missile.
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It also argues for speedier consolidation of Russia's nuclear warheads: some 20, 000 are still scattered over more than 120 sites.
Most nuclear warheads are designed for use with a specific delivery system, or means of delivering the weapon to the target.
By this logic, it would be interesting to see what weight would be given to the neutralization of 30, 000 nuclear warheads.
In November Britain and France signed a defence pact to share capabilities, including research on nuclear warheads and the operation of aircraft-carriers.
Pakistan is believed to have between 30 and 40 nuclear warheads, according to the U.N. nuclear watchdog, the International Atomic Energy Agency.
High-power algorithms and supercomputers, the muscle-bound, multimillion-dollar machines long used to design nuclear warheads and forecast the weather, have cracked the business market.
One is the development spending forgone as a result of the huge cost of building nuclear warheads and the means to deliver them.
But physicist David Albright, president of the Institute for Science and International Security, believes it may be capable of mounting nuclear warheads on Rodongs.
This week, India announced it will soon fire a new missile capable of carrying nuclear warheads across much of Asia and the Middle East.
In Russia, they thought through the implications of the U.S. withdrawal from the ABM Treaty and helped negotiate the Moscow Treaty, dramatically reducing nuclear warheads.
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Pakistan is important to the region, to the world, and to us, because Pakistan has a hundred nuclear warheads, and they're rushing to build a lot more.
The accord will limit the two countries to between 1, 700 and 2, 000 deployed strategic nuclear warheads, down from a level of about 6, 000 each, within 10 years.
Both India and Pakistan are proven nuclear powers after last year's tit-for-tat tests, and it is believed they may each possess a small number of nuclear warheads.
The United States has conducted more nuclear tests than the rest of the world combined and has thousands of nuclear warheads loaded on every conceivable delivery system.
Factor in waning supplies from recycled Russian nuclear warheads, which make up a substantial portion of world uranium reserves, and there is a clear need for new supply.
Such missiles could potentially be used to carry nuclear warheads.
Second, the new agreement not only calls for reductions in the number of nuclear warheads (to between 1, 500 and 1, 675), but for cuts in the number of strategic force launchers.
An example is the Minot incident, where six live nuclear warheads were mistakenly loaded onto a B-52 and flown from North Dakota down to Barksdale Air Force Base in Louisiana.
Yet that facility, which is essential for modernization to extend the life of aging ballistic nuclear warheads, has now been delayed for at least five years, and some believe, permanently.
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