He was referring the summit statement signed by the two leaders - the first-ever US-North Korean summit - in which Kim agreed in broad terms to "work toward denuclearisation" of the Korean Peninsula.
But at the border village of Panmunjom on Thursday, the North Koreans were a no-show for their scheduled working-level talks with US officials on the repatriation of American troops killed in the North during the Korean War.
"Repatriation of USA remains from North Korea will be important not just to American families, but to building trust between the US and North Korea as well", Pompeo said earlier this week.
More details were not immediately available.
"A very nice note from Chairman Kim of North Korea". The president rattled US allies by demanding that the other NATO nations pay more toward their own defense, although he stopped short of threatening to pull the United States out of the trans-Atlantic alliance.
Defence officials have already shipped dozens of cases to Panmunjom in anticipation of receiving the remains of USA troops.
The meeting was to focus on the return of remains of America's war dead killed during the Korean War.
But while improving relations and decreasing hostility has certainly been a benefit of Trump's diplomatic push on North Korea, it's been a means to the end of denuclearization. Pompeo's visit last week was meant to begin more detailed negotiations to flesh out the details.
What about the planned repatriation meeting?
Other speculation is that North Korea was discomforted with the way it was portrayed by the USA media _ as trying to make money from the war remains.
"It is likely that military generals from the US and North Korea will take part in the meeting".
That number includes 7,702 who are missing in action, with an estimated 5,300 believed to have been lost in the North, according to the Hawaii-based DPAA, which oversees the effort.
"Just heard Foreign Minister of North Korea speak at U.N. If he echoes thoughts of Little Rocket Man, they won't be around much longer!" Identities would not be confirmed until after what is often a lengthy and complicated forensics process.
According to the Pentagon, North Korean officials have indicated in the past that they have the remains of as many as 200 United States troops.
Between 1996 and 2005, some 33 recovery operations were conducted in North Korea which saw 200 sets of remains returned.
Critics at the time also argued the North was using the program to extort money from Washington, prompting the label "bones for bucks".
The remains of some U.S. soldiers were last returned in 2007, when then-New Mexico Governor Bill Richardson visited Pyongyang.
US State Department spokeswoman Heather Nauert said North Korea has now offered to meet the delegation on Sunday. 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". He added that "great progress being made!".
The U.S. says North Korea has continued to smuggle refined petroleum products into the country in excess of the quota of 500,000 barrels per year allowed under United Nations sanctions imposed because of nuclear and missile programs.
While in Brussels for the annual NATO summit on Thursday, both Trump and Pompeo expressed confidence in the diplomatic process with North Korea despite lacking of tangible signs of progress. Pyongyang has asked the UN Command Armistice Commission to upgrade the talks to a higher level to include a US general, South Korea's foreign ministry said.