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The US Nuclear Umbrella Over South Korea

The United States has maintained a nuclear umbrella over South Korea since the Korean War, when nuclear weapons were first deployed to the Pacific for potential use against China in case U.S. forces fighting in Korea were defeated by Chinese forces. In January 1958, the first nuclear weapons were deployed to South Korea and nuclear weapons remained in the country until late 1991 when the last weapons were withdrawn.

Since 1991, the United States has sought to reassure South Korea -- and signal to North Korea -- that the nuclear umbrella is intact despite the absence of nuclear weapons on the ground, made up by nuclear weapons deployed in the United States and onboard ballistic missile submarines deployed in the Pacific Ocean.

Below follows brief overviews and copies of recent reaffirmations of the U.S. nuclear umbrella over South Korea.

Shortly after the North Korean nuclear test, U.S. Defense Secretary Donald Rumsfeld and Korean Defense Minister Yoon Kwang Ung reaffirmed the nuclear umbrella over South Korea.

Nuclear Brief October 23, 2006

Nuclear Umbrella Reaffirmation Follows Nuclear Korean Nuclear Test

Less than two weeks after North Korea tested a nuclear devise, the United States and South Korea issued a joint communiqué from the 38th Security Consultative Meeting that reaffirmed the U.S. nuclear umbrella over South Korea. Unlike the 2005 communiqué (see below), the 2006 statement reaffirmed the "continuation of the extended deterrence offered by the U.S. nuclear umbrella."

Analysis: Feeding North Korean Threat Perceptions

The 2006 reaffirmation appeared in the third paragraph of the communiqué, four paragraphs up from the 2005 statement, and was made in the context of the North Korea test on October 9. The statement explicitly mentioned "extended deterrence," rather than the more ambiguous "provisions of the nuclear umbrella" term used in the 2005 communiqué. Presumably, the intension has been to make the reaffirmation more a little more explicit given the new circumstances.

One audience for this statement is South Korea, in an apparent attempt to reassure Seoul and thwart any thoughts about a need to develop nuclear weapons. This message is also intended for other non-nuclear countries, including Japan, that there are real security benefits from abstaining from developing nuclear weapons and adhering to the provisions of the Non-Proliferation Treaty.

Another audience is North Korea, making it a little clearer than before that any aggressive moves by them against the South could, potentially, trigger a nuclear response from the United States. This message is also intended to other potential nuclear proliferators such as Iran.

Yet the reaffirmation of the nuclear umbrella comes at a time when it seems urgent to limit the role of nuclear weapons in the region, not reaffirm the role. President George Bush's condemnation of North Korea's nuclear test called for a "denuclearized" Korean Peninsula, yet that vision seems unattainable if all sides continue to insist that nuclear weapons are vital for their national security. The North Korean test suggests that the time has come to design a security structure in the region that does not rely on nuclear weapons.

U.S. Defense Secretary Donald Rumsfeld and Korean Defense Minister Yoon Kwang Ung chose not to modify the U.S. nuclear umbrella over South Korea.
Nuclear Brief October 24, 2005

Nuclear Umbrella Over South Korea Reaffirmed

The 37th Security Consultative Meeting between the United States and South Korea on October 21, 2005, decided to reaffirm the continued existence of a U.S. nuclear umbrella over South Korea rater than modify it to appease North Korean concerns.

The Joint Communiqué from the meeting states that "Secretary Rumsfeld reaffirmed the U.S. commitment to...the continued provision of a nuclear umbrella for [South Korea], consistent with the Mutual Defense Treaty."

In reaffirming the nuclear umbrella, Rumsfeld and Yoon noted "North Korea's continued development of WMD, and long-range missiles." They said that "a solid combined defense posture should be maintained in order to secure peace and stability on the Korean Peninsula and in Northeast Asia." The communiqué stated that the ROK-U.S. combined force capability "remains at peak readiness."

Analysis: Missed Opportunity?

The reaffirmation of the U.S. nuclear umbrella over South Korea comes only a month after the completion of the fourth round of the Six Part Talks, where North Korea agreed to "abandoning all nuclear weapons and existing nuclear programs and returning, at an early date, to the Treaty on the Non-Proliferation of Nuclear Weapons and to IAEA safeguards." The United States pledged at the same meeting that "it has no nuclear weapons on the Korean Peninsula and has no intention to attack...the DPRK with nuclear...weapons."

In light of that development, General Leon LaPorte, the commander of U.S. Forces in South Korea, told reporters prior to the 37th Security Consultative Meeting discussions included whether to soften the U.S. nuclear umbrella. According to several press reports, LaPorte said the language on the nuclear pledge was the subject of last minute talks between Rumsfeld's policy team and the South Korea defense ministry. "I think that's being discussed right now between OSD policy and MND policy. So that'll get worked out here I think in the next two hours," LaPorte told reporters traveling with Secretary Rumsfeld.

General Leon LaPorte (left) told reporters that the 37th Security Consultative Meeting considered whether to soften the U.S. nuclear umbrella over South Korea.

Instead, the nuclear pledge was reaffirmed with no apparent change. Why would the United States and South Korea see a need, at this particular time, to reaffirm the nuclear umbrella?

The answer may be a combination of several considerations, foremost a "wait and see" if North Korea carries through on its pledge. After all, North Korea publicly declared for the first time on February 10, 2005, that it had manufactured nuclear weapons "for self-defense," and on March 31, it added that it was a "full-fledged nuclear weapons state." Declaration aside, U.S. intelligence has assumed for more than a decade that North Korea probably has assembled several nuclear weapons. Yet neither side has provided evidence to back up their claim.

Another consideration may have been to assure South Korea of continued overall U.S. defense commitment. Changing the nuclear umbrella at the same time that the U.S. is reducing its conventional forces in South Korea may have been too much too soon.

Yet another consideration may have been China. The U.S. nuclear umbrella in the region is not focused on North Korea but also incorporates planning against potential Chinese aggression. Nullifying or weakening the umbrella over the Peninsula, some would argue, might leave South Korea open to potential Chinese coercion and send the wrong signal at a time when China is seem by some as trying to pressure Taiwan and reassert its influence in the region.

Finally, there is the issue of extended deterrence in the region in general. Japan is covered by part of the same umbrella as South Korea. Some may have been concerned that any weakening of the U.S. nuclear umbrella in the region could increase Japanese doubts about its own security arrangement with the United States and spawn Japan's own nuclear weapons ambitions.

Despite such considerations, the decision of the 37th Security Consultative Meeting to reaffirm the nuclear umbrella over South Korea appears to have missed an important opportunity to use the status of the umbrella as an additional incentive to move the nuclear agenda on the Korean Peninsula forward. Rather than simply reaffirming the umbrella as is, the United States and South Korea could have made it conditional on North Korea carrying through on its pledges to give up nuclear weapons and rejoin the Non-Proliferation Treaty.

An unmodified umbrella makes the U.S. look disingenuous when it says it has no intention to attack North Korea with nuclear weapons, and it gives North Korea an easy excuse to question the credibility of the Joint Statement of the Fourth Round of the Six-Party Talks.

© Hans M. Kristensen/Federation of American Scientists | www.nukestrat.com | 2004-2006



download documents:

» The 38th Security Consultative Meeting Joint Communiqué," United States State Department, October 20, 2006. [0.02 MB]

» "The 37th Security Consultative Meeting Joint Communiqué," United States State Department, October 21, 2005. [0.03 MB]
 

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  © Hans M. Kristensen