Primer: North Korea could now have as many as 60 nuclear warheads in its inventory. The new number is more than double the maximum estimate of 20 to 25 weapons by Siegfried Hecker, former director of the Los Alamos National Laboratory and now a professor at Stanford University. Hecker was the last American scientist to visit North Korea’s nuclear weapons complex, in late 2010. Most estimates of the size of the North’s inventory have been far more conservative, generally in the range of 12 to 15 to 20.
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Japan defense white paper to concede North Korea has miniaturized nuclear warheads, report says
Reuters, Kyodo
