Washington's top nuclear negotiator took a new proposal to North Korea on Wednesday to try to salvage a derailed disarmament pact, Associated Press reported. Assistant U.S. Secretary of State Christopher Hill drove into the North through the heavily fortified Demilitarized Zone dividing the two Koreas late Wednesday morning, U.S. Embassy spokesman Aaron Tarver said. North Korea's official news agency, KCNA, reported only that Hill and his team had arrived in Pyongyang, the capital of the reclusive Stalinist state, just a few hours' drive from the border.