Instead, senior North Korean officials have discussed their intention to deceive Washington about the number of nuclear warheads and missiles they have, as well as the types and numbers of facilities, and to rebuff worldwide inspectors, according to intelligence gathered by USA agencies. They believe North Korea is building at least one of its Hwasong-15 missiles there.
The official did not rule out a one-on-one meeting between Pompeo and his North Korean counterpart on commitments made during the historic June 12 summit in Singapore between President Donald Trump and North Korean leader Kim Jong Un.
"Until the ink is dry on an agreement it's unrealistic to expect the DPRK to stop its programs", Wit wrote on Twitter on Monday, using the acronym for North Korea's formal name.
Byrd said a single identification "dog tag" was also handed over by the North Koreans.
Defense Secretary Jim Mattis said last week that the return of the 55 boxes was a positive step but not a guarantee that the bones are American.
The two discussed various bilateral issues, officials said, but neither Beijing, which supported North Korea in the war, nor Seoul confirmed whether they discussed a declaration ending the war.
The North Koreans provided enough specifics about where each suspected body was found that USA officials have matched them to specific battles fought from 1950 to 1951, though not necessarily individuals, he said.
The remains will be examined at the Defense POW/MIA Accounting Agency, and experts there will be responsible for identifying the remains.
On Wednesday, Vice President Mike Pence will greet 55 flag-draped cases of what are believed to be the remains of American service members killed in the Korean War during a ceremony today at Joint Base Pearl Harbor-Hickam in Honolulu. The commander of US Forces Korea, General Vincent Brooks, said at the recent Aspen Security Forum that North Korea's "production capability is still intact". "And for all in attendance, this is a solemn reminder that our work is not complete until all have been accounted for, no matter how long it takes to do so".
No official agreement was struck between Trump and Kim, but both sides are working on a deal.
Trump last week again thanked North Korea's Kim for returning the remains.
Lieutenant-General Ahn Ik San, who is leading the North Korean delegation at the military talks, noted South Korean news reports suggesting he might try to persuade the South to push for a joint declaration with the U.S. to formally end the war.
An armistice that ended the Korean War has yet to be replaced with a peace treaty, leaving the peninsula in a technical state of war.
Several U.S. officials and private analysts said the continued activity inside North Korea's weapons complex is not surprising, given that Kim made no public promise at the summit to halt work at the scores of nuclear and missiles facilities scattered around the country. "North Korea is not negotiating to give up their nuclear weapons", Lewis said.
The remains may include UK casualties and the DNA samples will be used to support identification, over a number of years, to make sure any UK personnel identified are ultimately given military funerals at the United Nations cemetery in the Republic of Korea.