FAS Strategic Security Blog

In condemning the North Korean nuclear test and repeating its call for a denuclearized Korean Peninsula, one of the Bush administration’s first acts ironically has been to reaffirm the importance of nuclear weapons in the region.

“The United States will meet the full range of our deterrent and security commitments,” President Bush told Japan and South Korea after last week’s test. On Wednesday, Secretary of State Condoleezza Rice strongly hinted that the commitments potentially include nuclear strikes against North Korea.

But is it helpful or counterproductive at this stage to threaten North Korea with nuclear weapons?
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In an extraordinarily brief statement, the Director of the National Intelligence Office announced that the United States has confirmed that North Korea’s large explosion last week was nuclear. How do they know and why did it take them so long to confirm?
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Last Sunday, North Korea apparently tested a nuclear explosive. The “apparently” is needed because the explosion was so small—by nuclear standards—that some have speculated that it may have been a large conventional explosion. What is the technical significance of the test, what does it mean, and what should we do now?

There is no question that the political and security implications of the test are huge and almost entirely negative. The technical implications are more mixed; the technical significance of the test is somewhat less than meets the eye.
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A decision to trim a tree in the Korean demilitarized zone in 1976 escalated into a threat to use nuclear weapons. After a fatal skirmish between U.S. and North Korean border guards, U.S. forces in the region were placed on heightened alert (DEFCON 3) and nuclear forces were deployed to signal preparations for an attack on North Korea. The North Koreans did not interfere with the tree trimming again, so the threat must have worked, the Pentagon concluded.

Thirty years later, North Korea has probably developed nuclear weapons and is trying to develop long-range ballistic missiles to threaten you-know-who, and the United States has ventured into a multi-billion dollar effort to build a missile defense system and a “New Triad” to better dissuade, deter, and defeat North Korea and other “rogue” states.

So, did the threat work?

The “tree-trimming incident,” as the U.S.-North Korean scuffle has come to be known, and other examples of using nuclear threats are described in the article “Nuclear Threats Then And Now” in the Bulletin of the Atomic Scientists.

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