a week of war threats by north korea. kim jong-un putting rockets on stand by and warning of possible strikes on hawaii, guam and the u.s. mainland. the united states responding to the threats by flying stealth bombers in a practice mission over south korea. an island near the korean border also is a target of the communist regime's fiery threats. our senior international correspondent matthew chance went there. this is a story you'll see only on cnn. >> reporter: across the yellow sea, the island flashpoints of this korean standoff. we traveled by high-speedboat, within sight of north korean waters, where tensions are making waves once more. along this ferry heading off the