updated 10/9/2006 12:13:43 AM ET 2006-10-09T04:13:43

North Korea announced Monday that it has tested a nuclear weapon, a claim that if true formally makes it the ninth nation known or generally thought to possess such arms. A glance at the world’s nuclear weapons states and their stockpiles, based on estimates compiled from different sources:

North Korea
Believed to have enough fissile material for a half-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 and tactical warheads.

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.

Approximately 350 strategic warheads.

As many as 250 strategic warheads and 150 tactical warheads.

About 200 strategic warheads.

Between 45 and 95 nuclear warheads.

Between 30 and 50 nuclear warheads.

Refuses to confirm it is a nuclear weapons state but is generally assumed to have up to 200 nuclear warheads.

Sources: Arms Control Association; Nuclear Threat Initiative.

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