I'm not 100% sure of that frank,I'm thinking it's all puff and bluster from North Korea,the leadership must know it would be on a hiding to nothing,and a certain death sentence for it,I'm thinking its pushing the boundaries to see how far it can go,and is willing to stop this for an easing of economic sanctions.
From what I can gather the regime is changing very slowly and opening the country up to outsiders,it's slightly easier now to visit,the numbers aren't as limited as they were,guides aren't as strict as they were,the big change has to come from within the country,if they want to change they've got to overthrow the glorious leader,not us,if the "free" world enforced change it'd be an absolute nightmare both for Koreans and China,who would be overwhelmed by refugees.
Trump is the bigger worry,now he is thin skinned,unstable,utterly clueless and downright scary