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Kim Jong Un might try to win more time (as their nuclear and ICBM capabilities still aren't known exactly and their rhetoric still can be called a bluff) and this occasion is good for them to soften the echo of recent events. Their proposition was a surprise (they took the initiative) and while Hanguk claims constantly they are always open to peace talks the current situation has the implication it was Choson who offered the olive branch and Kim Jong Un is the one who had the idea to set aside the enmity.