The US has a very active role in sabotaging the North Korean nuclear and missile programs. It just hasn't been publicized to the same degree as Stuxnet was with the Iranians.

Fresh Air did an episode on it a few weeks ago, following a New York Times article.

http://www.npr.org/2017/03/29/521909787/the-u-s-has-an-activ...

https://www.nytimes.com/2017/03/04/world/asia/north-korea-mi...