Well NK's nuclear facilities
have undergone some sort of catastrophic event that has rendered them beyond use. That's on the record. I guess the rest comes down to whether you believe that's just happy accident.
Of course, this catastrophe occurred in September 2017. At the same time, the USS Jimmy Carter returned to port flying the Jolly Roger indicating a successful covert operation. Again, it depends on your willingness to believe in coincidence, I guess.
https://nypost.com/2017/09/14/secret...nd-crossbones/