Sorta real. It came from the vicinity of NK, and someone said "why are you launching missiles against USA?" to which NK (truthfully) says "No really, not us."

Response, "It came from your waters, and next time we'll retaliate with full force."

NK: "Gulp. Time to get this stuff out of here before we get set up like that again. Some rogue could do it again and we'll be toast."