On November 12, during my most recent visit to the Yongbyon nuclear complex, North Korean scientists showed me and my colleagues, John W. Lewis and Robert Carlin, a small, recently completed, industrial-scale uranium-enrichment facility and an experimental light-water reactor (LWR) under construction.
I was stunned by the sight of 2,000 centrifuges in two cascade halls and an ultramodern control room. But it was not until the long drive back to Pyongyang that the political implications of these findings hit home. It will be more important than ever to limit Pyongyang's nuclear progress and calm tensions on the Korean peninsula. This is particularly true in light of the clash in the Yellow Sea between the two Koreas late last month.
Although I and other nonproliferation experts had long believed that North Korea possessed a parallel uranium-enrichment program -- and there was ample evidence for such a belief -- I was amazed by its
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