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On Thursday, Mr. Bosworth is expected to ask China for insights into last month’s talks in Pyongyang between North Korean leader Kim Jong-il and Chinese State Councilor Dai Bingguo, Beijing’s top foreign policy official. China has come under growing pressure to push ally North Korea to change its behavior.

North Korea will be a key issue during Chinese President Hu Jintao’s visit to Washington later this month.

Associated Press writer Kim Kwang-tae in Seoul and Cara Anna in Beijing contributed to this report.