The announcement came a day after the North called South Korean President Lee Myung-bak a "traitor."
Pyongyang recently threatened to suspend all inter-Korean dialogue, accusing Seoul of preparing preemptive strikes against its nuclear facilities.
In a radio message sent to Lt. Gen. Kim Yong-chol, the North's chief representative at inter-Korean military talks, the South's Defense Ministry said the North was intentionally misinterpreting Seoul's objectives and remarks.
"Our side has sincerely upheld the non-aggression agreement between the South and the North and this position will not change in the future," Seoul's chief delegate at North-South military talks, Maj. Gen. Kwon Oh-sung, was quoted as saying.
On Saturday, the North Korean general accused South Korea's new Joint Chiefs of Staff chairman, Gen. Kim Tae-young, of making remarks that hinted at possible preemptive strikes on the North's nuclear facilities and demanded that Seoul retract Kim's remarks and issue an official apology.
The Defense Ministry refused to apologize and rejected the accusation, saying Kim's remarks, made at his National Assembly confirmation hearing late last month, merely described the country's defense procedures in the event of an armed conflict.
In a sign of strained ties with Seoul, North Korea expelled all 11 South Korean government officials from a joint office in the Kaesong industrial complex last Thursday.
Seoul has said that the South Korea-funded industrial complex in Kaesong, on North Korean territory, will not be expanded unless progress is made in stalled negotiations on the communist state's nuclear programs.
Lee Myung-bak, the new South Korean president, has vowed to take a tough stance during negotiations with the North, and link further inter-Korean cooperation projects to progress in international negotiations over North Korea's nuclear programs.
Under an agreement reached last October between the United States, Japan, Russia, China, and North and South Korea, Pyongyang was to halt its nuclear programs and provide full information on nuclear activities by the end of 2007 in exchange for economic and political concessions. However, after the North missed the deadline, the six-way negotiations stalled.
Since the October deal, South Korea, China and Russia have each supplied North Korea with 50,000 metric tons of fuel oil.
