"U.S. Representative Curt Weldon (R-Pa.) suggested that North Korean officials during his recent visit to Pyongyang expressed concern about the United States obtaining a more capable nuclear earth penetrator. "
Deterrant to N.Korea. They will soon be unable to hide underground. HAARP can see you underground, and bunker busting nukes can kill you. Once they realize their facilities are about as safe as the fort you used to make with your mom's sofa cushions we can then ask them "Now, are you ready to play nice?"
From the looks of it, HAARP can do more than see you underground, in fact it looks to lil-o-me that bunker busters arn't needed with HAARP in our corner.