North Korea's delegation rejected a U.S. proposal to keep currentnuclear negotiationsalive and instead returned to Pyongyang today. Talks broke down over the issue of replacing North Korea's gas-graphite reactor with light-water models manufactured by South Korea. The plan offends North Korea's sense of propriety explainsTIME Diplomatic correspondent J.F.O. McAllister: "This may be their typical tactic of going back on an agreement or they may really be drawing a line in the sand." It is not yet clear whether North Korea will abandon its stand-still agreement with the U.S. andresume nuclear weapons development.