The US military believes the bones are those of American servicemen and potentially servicemen from other United Nations member countries who fought alongside the US on behalf of South Korea during the Korean war.
The remains began their flight back to the USA on Wednesday evening local time, after a repatriation ceremony at Osan Air Base, located some 40 miles south of Seoul.
If they were to happen, either of the trips would mark a significant shift in US-North Korea relations, particularly after the bellicose rhetoric the two leaders exchanged in 2017.
During their meeting in Singapore, the first ever between sitting leaders of their respective countries, both Kim and Trump committed to recovering the remains of United States service members who died during the Korean War and whose bodies were never found.
The pledge to return the remains of USA soldiers was made during a landmark summit between Trump and Kim in June in Singapore, where North Korea committed to work toward the complete denuclearization of the Korean peninsula.
Since then, the remains have been kept at a US military base in South Korea. "Very meaningful." Around 629 sets of remains have returned home so far since 1990, according to United Nations Command.
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At the summit, North Korea had agreed to eventually denuclearize in return for unspecified security guarantees from the U.S. Byrd said the process to fully identify the remains, now more than 60 years old, could take anywhere from days to decades.
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Their roles were expected to feature more prominently in the Washington trial later this autumn. Attorneys on both sides were also told by the judge to "reign in their facial expressions".
Last Friday, North Korea returned what were said to be dozens of remains of American soldiers missing from the 1950-53 Korean War, something Kim promised during his summit with Trump.
The remains were then moved in grey vans to an airfield where US and South Korean soldiers loaded them one by one into transport planes.
Many Americans who went missing were prisoners of war who died before the war ended or were left behind during enemy advancements.
The reports about new rocket development come after ongoing disclosures about a speculated uranium advancement office, called Kangson, that North Korea is working in mystery. Other U.S. service members were captured and placed in prisoner-of-war camps, where many succumbed to starvation, exposure and torture.
During the Singapore meeting, Kim also committed to the denuclearization of the Korean Peninsula while Trump promised to provide him with security assurances. F-16s flew in formation over the ceremony to honor the missing soldiers who fought in the Korean War, before each casket was brought in by a van - six caskets at a time.
But Trump now faces criticism at home and elsewhere that North Korea hasn't taken any serious steps toward disarmament and may be trying to buy time to weaken global sanctions against it. Duus said the DPAA is still working to identify remains it received in the 1990s and early 2000s. In return, Trump canceled large USA military exercises with South Korea and promised Kim unspecified security assurances. The two sides remain technically at war because a peace treaty was never signed.
U.S. Secretary of State Mike Pompeo will press southeast Asian nations in Singapore this week to maintain sanctions against North Korea, a U.S. official said on Tuesday, amid concerns that fuel is being sold illegally to Pyongyang despite U.N. sanctions.