Lets think about what Kimmy wants. Since he took power in 2011 he's stated he wants to be the one to end the Korean war, he's stated that he wanted peace.
It is true that he's had temper tantrums about our military exercises on the border and shit, but he considers them an act of war so I can understand some pissing and dick waving over it.
Then there's Moon, who's the one driving all of this in the reality - he's the one who reciprocated peace and reunification with N Korea. I don't think we have a 'legal' leg to stand on to prevent their peace so we can wave our military dick around on their border. The way I see it they both want peace, and we should facilitate it.