NK has claimed it will be an AIR BURST. That will cause an EMP. Such an EMP could down civilian airliners and affect Japan as well as other countries.
It’s time to put a 50 million US$ reward out for the assassination of KJU . Attach the offer to 10’s of 1000’s of helium balloons and release them when the wind is right , in south Korea . 50 mil is peanuts compared to what outright war with the entire of NK would cost . Surely some enterprising NK ‘security official ‘ would find the idea very attractive .