North Korea agreed to a new round of six-nation talks next week aimed at dismantling its nuclear weapons programs, officials announced Tuesday. But representatives of the four Asian countries involved immediately sought to play down the prospects of a quick resolution to the 20-month crisis in which the North Koreans are believed to have expanded their nuclear arsenal. High-level disarmament talks are scheduled for June 23-26 in Beijing, after a two-day round of mid-level negotiations starting June 21, according to Chinese, Japanese and South Korean officials. The talks — involving the United States, China, Russia, Japan, South Korea and North Korea — follow two rounds of high-level negotiations and one round of mid-level meetings, which all failed to yield significant results. Full Story