Fascinating to consider North Korea's missile efforts aimed at delivering a nuclear EMP rather than traditional nuclear ordnance.
Explode high in the air w/o requiring the precision or re-entry capability of traditional ICBMs.
Changes whole flavor of the aperiodic missile launches from NK into Sea of Japan.
Interesting writeup / sources:
http://www.israelnationalnews.com/News/News.aspx/193908
Great Frank Rieger writeup:
https://medium.com/@frank_rieger/some-wild-speculation-6fbcf856007d