A list of nations which currently have nuclear weapons
* North Korea - Believed to have enough fissile material for about half a dozen weapons, but estimates vary widely and are unverifiable.
* The United States - More than 5,000 strategic warheads, more than 1,000 operational tactical weapons - meant for the battlefield and less powerful than the strategic arms - and approximately 3,000 reserve strategic and tactical warheads.
Became the first country to carry out a nuclear test explosion on July 16th, 1945.
* Russia - Nearly 5,000 strategic warheads, and approximately 3,500 operational tactical warheads. In addition, it has more than 11,000 strategic and tactical warheads in storage. Exploded its first bomb in 1949.
* France - Approximately 350 strategic warheads. Exploded its first bomb in 1960.
* China - As many as 250 strategic warheads and 150 tactical warheads. Exploded its first bomb in 1964.
* Britain - About 200 strategic warheads. Exploded its first bomb in 1952.
* India - Between 45 and 95 nuclear warheads. Exploded its first bomb in 1974.
* Pakistan - Between 30 and 50 nuclear warheads. Exploded its first bomb in 1998.
* Israel - Refuses to confirm it is a nuclear weapons state but is generally assumed to have up to 200 nuclear warheads. Unknown when Israel might have carried out a test explosion.
(Sources: Arms Control Association; Nuclear Threat Initiative.)