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“It appears North Korea is cooling off after being infuriated at South Korea during the mourning period for Kim Jong-il,” said Koh Yu-hwan, a North Korea professor at Seoul’s Dongguk University. “North Korea understands its relations with South Korea should improve for progress in its relations with the United States.”

The Korean Peninsula is still technically at war because the 1950-53 Korean War ended with an armistice, not a peace treaty.

Associated Press writers Hyung-jin Kim, Sam Kim and Foster Klug contributed to this report from Seoul.