If NoKo is a concern of yours, then I suggest that you gear some prep resources towards an EMP event. NoKo has 2 satellites in polar orbits that come right over the USA 2-4 times a day. Officially they are a type of observation type of platforms geared towards weather, crop growth, etc.

If you believe that, I suggest you find and read the opening strike for the Soviet plan to nuke us in 1965....