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The Six Party Talks on North Korean nuclear issues have been ongoing since August 2003. They have not prevented North Korea from having nuclear weapons. Nevertheless, the goal to denuclearize the Korean peninsula has been agreed upon by all six countries, including North Korea. Whether these talks will reach that goal is unclear and uncertain. However, the talks have brought the six countries, or at least the United States, China, the Republic of Korea, Japan, and Russia, closer in terms of regional security. All six have agreed to an official dialogue on a multilateral security cooperation mechanism in Northeast Asia. This dialogue is useful and encouraging.
Shulong et al. (Tue,) studied this question.