North Korea describes the move as as `` unpardonable provocation '' Heavy bombers taking part in U.S.-South Korea exercises . Pentagon : A Pentagon spokesman said Monday that B-52 bombers are making flights over South Korea as part of military exercises this month . ` U.S. military is ready to defend itself against any attack by Pyongyang B-52s flying from base on Guam .
North Korea describes the move as as `` unpardonable provocation '' Heavy bombers taking part in U.S.-South Korea exercises . Pentagon : U.S. military is ready to defend itself against any attack by Pyongyang B-52s flying from base on Guam .