North Korea has co-operated fully with the shutting down of its main nuclear reactor, UN inspectors have said.
The shutdown of Yongbyon has been a key part of the deal
The head of an International Atomic Energy Agency (IAEA) team there said they had been able to undertake the work they were sent to do.
The North shut its Yongbyon reactor on 14 July - fulfilling the first part of a disarmament deal agreed in February.
Nations involved in talks that secured that deal have met on the sidelines of the annual Asean meeting in Manila.
Delegates from the six countries involved - North and South Korea, the US, China, Japan and Russia - were expected to discuss how to move forward with February's deal to end North Korea's nuclear weapons programme.
Under the first phase of the deal, Pyongyang shut its five known nuclear facilities at Yongbyon in exchange for 50,000 tons of fuel oil.
The next phase obliges the North Koreans to permanently disable the installations in exchange for one million tons of energy aid.
The team of IAEA inspectors left Pyongyang on Tuesday, ending their two-week mission to monitor the shutdown of Yongbyon.
"In doing our actions, we had complete co-operation from the DPRK (North Korea) authorities," the head of the team, Adel Tolba, told reporters at Beijing airport.
He did not go into details of the mission, saying an assessment would be carried out at the IAEA headquarters in Vienna.
But he gave no sign of problems. "We think that what we need to perform was performed," he said. "We did perform all the mandated activities".
A replacement team of six IAEA inspectors arrived in North Korea over the weekend.