Most observers say North Korea is still years away from having the technology to deliver a nuclear warhead on a missile , but it does have plenty of conventional military firepower , including medium-range ballistic missiles that can carry high explosives for hundreds of miles . North Korea says it will put military units `` on the highest alert '' It says the units target locations including the U.S. mainland , Hawaii and Guam . The statement said that if war breaks out between Pyongyang and Washington, Seoul would be hit with a massive artillery barrage from both sides of the border. The North is angry over U.N. sanctions and U.S.-South Korean military exercises .
North Korea says it will put military units `` on the highest alert '' It says the units target locations including the U.S. mainland , Hawaii and Guam . The statement said that if war breaks out between Pyongyang and Washington, Seoul would be hit with a massive artillery barrage from both sides of the border. The North is angry over U.N. sanctions and U.S.-South Korean military exercises .