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U.S. Secretary of State John Kerry on Friday met South Korean President Park Geun-hye in Seoul to discuss responses to the North Korean issue, amid high tension on the peninsula.

Seoul's presidential office said, Park appreciated Kerry's commitment at a meeting of foreign ministers from G-8 nations over the North Korean issue.

G-8 foreign ministers condemned on Thursday "in the strongest possible terms" North Korea's nuclear weapons and missile programme and warned that the North would face more sanctions in case of a missile launch.

The meeting came after a U.S. government agency said North Korea had a nuclear weapon it could mount on a missile, but the assessment was swiftly dismissed by several U.S. officials and South Korea.

The Defense Intelligence Agency (DIA) said it had concluded with "moderate confidence" that North Korea had developed a nuclear bomb that could be fitted on a ballistic missile, but added su