North Korea watchers downplayed the significance of the letter.
Trump shared the letter in a tweet Thursday, writing, "A very nice note from Chairman Kim of North Korea".
Trump posted the image of the Korean-language letter from Kim with its English translation.
The meeting was expected to be the first working-level talks between the two sides since Pompeo's visit to Pyongyang ended Saturday with North Korea denouncing the U.S.'s "unilateral and gangster-like demand for denuclearization".
An estimated 30,000 United States soldiers died in the Korean war.
According to the Pentagon, North Korean officials have indicated in the past that they have the remains of as many as 200 U.S. troops.
"We will be ready", U.S. state department spokeswoman Heather Nauert said.
"We will be ready", Mr Nauert said.
Moments From Peter Strzok's Testimony That You Must See
This information had the potential to derail, and quite possibly, defeat Mr. Marshal had to deliver Page the subpoena early in the morning.
While it was not immediately clear why the North Korean delegation skipped the meeting, the apparent snub reinforced skepticism around Pyongyang's willingness to commit to denuclearization of the Korean peninsula.
President Donald Trump shows the document that he and North Korea's leader Kim Jong Un signed acknowledging the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore, June 12, 2018. The talks Sunday are expected to involve officials from the Pentagon and the U.N. Command, which commanded USA -led allied forces during the war and is involved in maintaining the armistice that ended the fighting in 1953.
The Americans called North Korean representatives and scheduled a generals' meeting between the two nations to take place Sunday.
Pompeo gave a rosier readout.
Kim voices hope that "the invariable trust and confidence in Your Excellency Mr. President will be further strengthened in the future process of taking practical actions".
But there's growing skepticism in Washington over the Trump administration's engagement with North Korea.
Speaking hours earlier at a press conference in Brussels, Belgium, Trump pointed to North Korea's suspension of nuclear weapons and ballistic missile testing in the past eight months as a sign of progress in efforts to denuclearize the regime.
The Department of Defense estimates that North Korea is holding about 200 sets of remains from some 5,300 American military personnel believed missing in the country.
While the details are unclear, a setback on talks over the remains wouldn't bode well for broader negotiations about North Korea's nuclear program.
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