Pakistan is believed to possess a nuclear inventory of over 100 warheads.
According to the Federation of American Scientists, the United States has an estimated inventory of 7,200 nuclear warheads, with 1,900 of them strategically deployed.
Russia is estimated to have around 7,500 nuclear warheads, although the total is uncertain because there is no accurate count of tactical weapons. Of these, an estimated 1,750 are strategically deployed.
France has pared down its arsenal to approximately 300 nuclear warheads.
Britain's nuclear stockpile consists of about 200 strategic and "sub-strategic" warheads on four Vanguard-class nuclear-powered ballistic missile submarines.
China is estimated to have about 250 strategic and tactical nuclear weapons, and stocks of fissile material sufficient to produce a much larger arsenal.
India has formally declared itself a nuclear weapon state. New Delhi is likely to have manufactured weapons-grade plutonium for at least 100 warheads.
North Korea tested its first nuclear explosive device in October 2006 and its second in May 2009.
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