President Donald Trump took to Twitter Thursday to thank North Korean leader Kim Jong Un for the return of suspected remains of fallen US service members, commending the "kind action" and saying he looked forward to seeing the chairman again soon.
In a tweet, Mr Trump also thanked the North Korean leader for his "nice letter", without elaborating.
Details of the letter haven't been released by White House press secretary Sarah Sanders confirmed a letter from Kim was received by the administration on August 1.
Vice-President Mike Pence and US military leaders received the remains in Hawaii during a sombre ceremony on Wednesday.
"Some have called the Korean War the forgotten war", Pence said.
The pledge to transfer war remains was seen as a goodwill gesture by Kim at the Singapore summit, and was the most concrete agreement reached by the two sides so far.
Donald Trump threatens government shutdown if he doesn't get wall funding
He said that needed border security reforms included the wall, the visa lottery, catch-and-release policies, and immigration laws. Trump has requested $25 billion to build the border wall and $1.6 billion has already appropriated for the project.
Almost 7,700 American military service-people are still unaccounted for from the Korean War, according to the Department of Defense POW/MIA Accounting Agency, of which approximately 5,300 are thought to be in North Korea.
The remains are being sent to Defense POW/MIA Accounting Agency for forensic analysis in order to try to determine their identities.
North Korea previously returned the purported remains of foreign soldiers that turned out to be misidentified.
But there are reports North Korea continues to build nuclear missiles.
Air Force General John Hyten, who as commander of the U.S. Strategic Command oversees America's nuclear forces, said North Korea had clearly demonstrated its commitment to halt flight-testing missiles since none had launched since November.
But it is not clear if those remains have been repatriated as well.
Experts say positively identifying the decades-old remains could take anywhere from days to decades.