Kim Jong-un's Seoul trip not dependent on Kim-Trump summit schedule: S. Korean official

靑, 김정은 위원장의 답방시기에 대해 열려있어; 북미회담 일정과 연계할 일 아니야

The nation's top office is flexible when it comes to the timing of a visit to the South by the North Korean leader.
That's coming from a high ranking Cheongwadae official who spoke under the condition of anonymity,... that inter-Korean agreements, including the easing of military tensions near the border,... are being carried out just as planned.
And when it comes to Kim Jong-un visiting Seoul, as he has promised to do,... the official said it does not depend at all on the timing of his next summit with President Donald Trump.
As for the next Pyeongyang-Washington summit, White House National Security Adviser John Bolton has told U.S. media that it won't happen until next year.

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