President Trump shakes hands with North Korean leader Kim Jong Un at the Capella resort on Sentosa Island in Singapore on June 12. The U.S. Embassy in Seoul said it had no immediate information.
The letter is dated July 6 - the date when Secretary of State Mike Pompeo visited Pyongyang and seemingly made little progress in fleshing out details of North Korea's commitment for "complete denuclearization".
"This step will build trust & confidence btw US & DPRK", he tweeted on Monday, using the acronym for North Korea's official name.
American officials have been on standby for weeks and have sent wooden coffins and flags to Panmunjom in preparation for a handover.
North Korean leader Kim Jong Un has ordered his aides to "re-explain" to Tokyo the findings of a probe into the whereabouts of missing Japanese nationals suspected to have been abducted by Pyongyang decades ago, according to a South Korean activist.
North Korea reportedly has the remains of about 5,300 United States soldiers who were killed during the Korean War, which ended with an armistice in 1953.
The transfer of remains between North Korea and the United States has not taken place since 2005.
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.
Mr Kim agreed in broad terms to "work toward denuclearisation" of the Korean Peninsula when he met Mr Trump in Singapore last month.
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.
One observer pointed out that Trump would have likely criticized his response to North Korea had it been the reaction of another president.
North Korea had also released the three American prisoners the government had been holding ahead of the summit.
But following the meeting, North Korea released a statement calling the meeting "regrettable" and accusing the U.S. of using "gangster-like" tactics to push it towards nuclear disarmament.
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