( CNN ) -- Video shows the drills near the disputed maritime border with Seoul . The North has stepped up its rhetoric against inter-Korean President Li Gum-chol . `` We will turn South Korea into a sea of flames , '' a military deputy commander says .
Video shows the drills near the disputed maritime border with Seoul . The North has stepped up its rhetoric against inter-Korean President Li Gum-chol . `` We will turn South Korea into a sea of flames , '' a military deputy commander says .