OK, I am not a great fan of North Korea. I visited South Korea in 1994 and it had a vibrant economy even then. It would be good if those in North Korea were able to enjoy the same freedoms.
What worries me about the North Koreans is their nuclear weapons. They want to develop these.
As I speak the USA has not taken any action, despite threats. Personally, and I may well be wrong, I think a more likely scenario is deliberate hacking so that any nuclear tests fail and no political capital can be made from the tests.
See http://www.bbc.co.uk/news/world-asia-39604361 .