North Korea overshadows nuclear summit

Kim Jong Un (3rd R) attends a memorial service on the 100th day since the death of the late leader Kim Jong Il on March 25.
Kim Jong Un (3rd R) attends a memorial service on the 100th day since the death of the late leader Kim Jong Il on March 25.

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    North Korea overshadows nuclear summit

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Pyongyang is not on the agenda of Seoul's nuclear summit, but its ears must still be burning. Paula Hancocks reports.