One possibility from what I have heard reported on CNN and CNBC is the the UN is considering taking action against North Korea for its humanitarian abuses and crimes. For that reason, the theory goes, Kim is making "gestures".
I cannot imagine Kim is all that altruistic as to care about taking care of someone's health or even so fiscally responsible as to worry about the cost of taking care of two prisoners. It's a weird place and Kim operates in his own irrational way.
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