CNN correspondent Wolf Blitzer, who is travelling with Richardson in Pyongyang, said the North Koreans had agreed to let inspectors from the UN's International Atomic Energy Agency go back to its Yongbyon nuclear facility.
They had also agreed to allow fuel rods for the enrichment of uranium to be shipped to an outside country, and to the creation of a military commission and hotline between the two Koreas and the United States, Blitzer said.