Tensions between the two nations heightened dramatically after North Korea conducted its third nuclear test and launched a rocket earlier this year, and the United States and South Korea conducted their annual spring military exercises. North Korea's rhetoric has since cooled somewhat, but Kim suggested the ball is now in Washington's court.
North Korea wants to improve its economy, but "for this we need a peaceful environment," he said. "We need to secure peace and stability on the Korean Peninsula."
Kim, a former foreign minister who is seen as the North's senior statesman, also accused South Korean authorities of "divisive maneuvers" that have pushed the two Koreas into another cycle of confrontation.
North Korea last month indefinitely postponed reunions of families separated by the Korean War that had been set to begin within days, a setback after weeks of improving ties. Pyongyang was vague about its decision to cancel the reunions, which have not been held for three years. It accused unidentified conservatives in Seoul of a "reckless and vicious confrontation racket" against Pyongyang, a claim it routinely makes.
It also vowed, in similarly familiar rhetoric, to "take strong and decisive counteractions against the South Korean puppet regime's ever-escalating war provocations."
Tensions on the Korean Peninsula had been gradually easing, with the North dialing down its war rhetoric and seeking to restart various cooperation projects with South Korea. The biggest step has been the recent return of North and South Koreans to a jointly run factory park just across the border in North Korea after a five-month shutdown.