Kim gave the directive after his historic summit with U.S. President Donald Trump in Singapore last month, said Choi Sung-yong, head of a group representing families of South Koreans abducted by North Korea, citing an informed source in the North's capital.
Some remains have been returned to the US over the years, but very few since recovery efforts were mostly halted in 2005 as U.S.
"He's realized he can humiliate and ignore the U.S.as long as he flatters the president", Mount said.
That was the day Secretary of State Mike Pompeo arrived for two days of meetings with top North Korean officials, which ended on a sour note after Pyongyang blasted the US side for issuing a "unilateral and gangster-like demand for denuclearization".
"This step will build trust & confidence btw US & DPRK", he tweeted on Monday, using the acronym for North Korea's official name. About 100 wooden transport cases were sent to the DMZ in recent weeks to prepare for receiving United States troop remains.
North Korean representatives didn't show up for scheduled talks with the US about returning the remains of fallen American soldiers.
"We have to see the USA defense ministry's response, but the UNC reportedly gave a positive signal to North Korea, so there is a good chance of the talks taking place on Sunday", the source said.
Trade and tea with queen for Trump in a Britain in 'turmoil'
There are fears that demonstrations during Trump's three-day visit to the United Kingdom from Thursday could turn violent. Then, on Friday, he meets the Queen at Windsor Castle before making his way to Scotland for the rest of the visit .
The most contrarian nugget of Carlin's analysis was his assertion that the statement, and North Korean domestic media's coverage of the visit, suggests progress was made.
According to President Trump, returning the remains of US troops was agreed upon during the Singapore summit.
There are about 7,700 United States soldiers classified as missing in action from the war.
Senate Intelligence Committee Chairman Mark Warner, D-Virginia, wrote to Director of National Intelligence Dan Coats on Thursday, asking him to answer a number of questions related to North Korea's progress, in light of statements made by President Trump and Secretary of State Mike Pompeo.
North Korea had also released the three American prisoners the government had been holding ahead of the summit. Despite the secretary's attempt to put a positive spin on the visit, as soon as he was out of the country, North Korea criticized his "unilateral and gangster-like" demands and called the talks "regrettable". But it didn't commence at the scheduled time as North Korean officials didn't show up.
Mount said Trump's reaction would be a concern.