( CNN ) -- New video broadcast on North Korean television shows a military unit carrying out live-fire drills in sight of a South Korean island . The military exercises this week on the southwestern coast of North Korea were close to the disputed maritime border . State television , KRT , also shows tanks repositioning and an artillery machine being prepared , overlooking waters that have seen a number of violent incidents over the years . North Korea shelled Yeonpyeong Island in November 2010 , killing four South Koreans , claiming it was responding to a South Korean military drill in the area . Fiery rhetoric accompanied the military actions . Deputy commander Li Gum-chol said , `` We will turn Seoul into a sea of flames by our strong and cruel artillery firepower , which can not be compared to our artillery shelling on Yeonpyeong Island . We are training hard , concentrating on revenge to shock Lee Myung-bak 's traitorous group and the military warmongers in South Korea . '' Pyongyang has stepped up its rhetoric against South Korea 's President Lee Myung-bak and his government since Kim Jong Un took over as North Korean leader last December after the death of his father , longtime leader Kim Jong Il . The footage and fresh threats against South Korea come just one week after the United States and North Korea agreed on a nuclear deal after years of deadlock . North Korea effectively agreed to freeze its nuclear program and the United States agreed to provide 240,000 metric tons of food aid . The two sides are due to meet Wednesday to discuss the technicalities of the nutritional aid . The United States and South Korea are currently carrying out annual joint military drills , which North Korea has condemned as a provocation . Now Pyongyang is staging its own . The United States has long said improved inter-Korean relations are crucial for success in nuclear talks , but the recent increase in rhetoric against South Korea and its president make that appear unlikely in the short term .
Video shows the drills near the disputed maritime border with South Korea . The drill is part of a series of military exercises that began in March and are expected to continue through September. `` We will turn Seoul into a sea of flames , '' a military deputy commander says .