President Donald Trump has published a letter sent to him by North Korean supreme leader Kim Jong Un, in which the young ruler praises his USA counterpart but does not mention any commitments to abandon nuclear weapons.
Pompeo was in Pyongyang from Friday to Saturday to try to flesh out a bare bones denuclearisation deal made during last month's historic summit between Kim and US President Donald Trump.
Donald Trump and Kim Jong-un pictured during their summit in Singapore on June 12.
Kim said he hoped the process between the two sides would lead to "practical actions" in the future, though he offered no specifics, and that there would be a second meeting between the two leaders.
North Korean officials have failed to turn up for talks with a USA team on the repatriation of the remains of American soldiers killed in the Korean war.
An estimated 30,000 United States soldiers died in the 1950-53 Korean war.
"Both the USA and the North are still in discussion over when to meet", the official added.
"I deeply appreciate the energetic and extraordinary efforts made by Your Excellency Mr President for the improvement of relations between the two countries and the faithful implementation of the joint statement". "We will be ready", she told reporters aboard Pompeo's plane, as the top USA diplomat flew home to Washington after attending a North Atlantic Treaty Organisation summit. "Great progress being made".
State Department spokeswoman Heather Nauert said the North Koreans called around midday to say the meeting would be delayed until Jul 15.
North Korea has reportedly proposed holding general-level military talks with the United Nations Command (UNC) over the repatriation of remains of American troops killed during the 1950-53 Korean War, sources here said Thursday. 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. Add North Korea as an interest to stay up to date on the latest North Korea news, video, and analysis from ABC News.
One observer pointed out that Trump would have likely criticized his response to North Korea had it been the reaction of another president.
Pompeo insisted the talks were making progress but as soon as he left, the North's foreign ministry berated him over his "unilateral and gangster-like" demands and for offering no constructive steps on the U.S. side.