Following the face-off last month at Yeonpyeong border island, military tensions have multiplied manifold among the two countries. North Korea has said that another war with South Korea would involve nuclear weapons. The state media reported that the military would be alerted if South Korea proceeds with its live-fire drill on the border island.
"Because of the South Koreans' reckless war policies, it is not about war or peace on the Korean peninsula but when the war will break out," North Korea's official website, Uriminzokkiri said.
Pyongyang had disclosed last month of the existence of a uranium-enrichment plant and led to fears among neighbouring regions. The North's ruling communist party newspaper Rodong Sinmun described the peninsula as the world's most dangerous place.
"The Korean peninsula remains a region fraught with the greatest danger of war in the world," the paper said. "This is entirely attributable to the US pursuance of the policy of aggression against the DPRK (North Korea)."