North Korea vowed Friday to launch "retaliatory military actions" against South Korea, a threat that came days after Seoul said its military had used photos of Pyongyang's ruling family for target practice. The North's fiery statement is part of barrage of rhetoric this week aimed at the conservative government of South Korean President Lee Myung-bak, who took office in 2008 with a harder line than his liberal predecessors. Pyongyang sees "no need to sit face to face with the Lee group of traitors" and believes the only way to settle differences with Seoul is "by force of arms," the statement by an unidentified spokesman for the general staff of the North's Korean People's Army said. "From now on," the statement said, the North "will launch practical and overall retaliatory military actions to wipe out the group of traitors at a stroke." The North has regularly lashed out against Lee. Lee halted unconditional aid and linked South Korean assistance to progress in North Korea's nuclear disarmament efforts. Pyongyang branded Lee "human scum" and a traitor to Korean reunification. Friday's statement made apparent reference to South Korean marines and some army units using pictures of North Korean leader Kim Jong Il, his son and heir-apparent Kim Jong Un, and his father, the North's revered founder Kim Il Sung, as firing targets since the North's deadly shelling of a South Korean border island in November. The South said Tuesday it would tell units to use only standard targets.