Several days previously, Pyongyang had slated the USA for seeking unilateral and forced denuclearization from North Korea.
However, officials say it could be months before excavations can begin and years until the remains are identified.
Warner highlighted the June 12 summit document from Mr. Trump and Kim in which Kim reaffirmed his commitment towards complete denuclearization, Pompeo's comment earlier this week that the US had "detailed, substantive" conversations about total denuclearization, and Mr. Trump's tweet after the summit in Singapore declaring "there is no longer a nuclear threat from North Korea".
The White House had said earlier Pompeo would meet with the leader, but the encounter did not materialise and the top U.S. diplomat only met with Kim Yong Chol.
Pompeo, speaking Wednesday to reporters as he arrived in Brussels for a NATO summit with President Donald Trump, said that change was up to North Koreans. "Looking round farm machines and tractors of the workteam, he acquainted himself with how many tractors it has and how it operates them", KCNA reports. But it didn't commence at the scheduled time as North Korean officials didn't show up.
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At high-level talks last week, North Korea and the US confirmed they are still poles apart on the next steps to be taken in the process.
When Trump announced the USA would halt joint military drills with South Korea, he backed his controversial move by citing the "tremendous" costs of such exercises.
United Nations honor guards carry on December 14, 1993 a soldier's remains who died during the Korean War.
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Trump faced a backlash for scrapping the drills, with critics saying he gave in too readily to Kim's request to halt the exercises while getting little in terms of tangible commitments from Pyongyang in return.
South Korea's urbanization is one reason why more than a 1,000 USA service members are unaccounted for, said McKeague.
Between 1996 and 2005, some 33 recovery operations were conducted in North Korea which saw 200 sets of remains returned. Kim praises the significance of their meeting and the joint statement they put out, but the letter doesn't do much to support Trump's claim that progress is being made in his stated goal of denuclearizing North Korea.