North Korean leader Kim Jong-un visited military units that launched the 2010 artillery attack on South Korea\'s Yeonpyeong Island and called on troops to be ready for a confrontation with the enemy, a media report said Friday. The Korean Central News Agency (KCNA) monitored in Seoul said Kim visited the front-line units on Mu and Jangjae islets in the early hours of Thursday and told soldiers to be ready to destroy enemy targets at a moment\'s notice if the order is given. He also said that the Nov. 23 artillery attack annihilated efforts by the warmongers in the South to provoke the North, and claimed the event was the most satisfying engagement since the Armistice Agreement that halted the Korean War was signed.