Negotiators from six-nation talks in China have agreed steps to verify North Korea's nuclear disarmament.
Officials from China, the United States, Russia, Japan and the two Koreas agreed Pyongyang would finish disabling its main nuclear facility by October.
The other nations will complete deliveries of fuel and economic aid ahead of visits by verification teams.
The deal came after South Korea proposed reviving direct talks with the North in a major policy shift.
President Lee Myung-bak told parliament on Friday he was willing to carry out previous bilateral summit accords and provide the impoverished North with food aid.
The agreement is the latest stage of a six-party deal reached in February 2007, when the North said it would scrap its nuclear ambitions in return for aid and diplomatic concessions.
Last month, North Korea handed over a long-delayed list of its nuclear activities and demolished the cooling tower at its main plutonium-producing nuclear reactor.
Announcing the latest agreement, the head of the Chinese delegation Wu Dawei said the verification process would include experts from the six nations visiting facilities, reviewing documents and interviewing technical personnel.
He said the UN's nuclear watchdog, the International Atomic Energy Agency, could also be asked to help if necessary.
Despite the progress, there are still some major potential stumbling blocks in the way of the long-term goal of completely dismantling all of North Korea's nuclear programmes.
Some experts believe North Korea has already produced enough weapons-grade plutonium to make as many as 10 nuclear bombs and the US has also accused Pyongyang of running a second weapons programme based on uranium. \
