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North Korea's shock October test may have been an attempt to produce a smaller warhead to put on a missile.

Some reports claimed that at least one of these test launches was carried using a nuclear warhead, but this cannot be confirmed.

At the height of the Cold War, the United States and the Soviet Union had between them tens of thousands of nuclear warheads.

For a while, perhaps through the decade, the United States would retain a clear edge in numbers of warheads.

A senior defence official said the report "identified issues about record keeping" for sensitive nuclear missile components.

China also has a few intercontinental ballistic missiles , able to carry a nuclear payload .

The destruction of the last nuclear warhead will coincide with the age of greater global solidarity.

Mr Lee reiterated that the ultimate goal of any negotiations should be decommissioning Pyongyang's atomic warheads.

But at times, recycled Soviet bomb cores have made up the majority of the American market for low-enriched uranium fuel.