South Korea says it has its military units ` ` on the highest alert '' It says the units hit targets on the Korean mainland , Hawaii and Guam . The U.S. says it is ` ` fully capable '' of defending itself and its allies . 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 U.S. says it is `` fully capable '' of defending itself and its allies . The North is angry over U.N. sanctions and U.S.-South Korean military exercises .