Separately, North Korean officials did not show up at planned talks with the USA on Thursday to discuss repatriating the remains of American soldiers killed during the 1950-53 Korean War.
North Korean leader Kim Jong Un has sent a letter to President Donald Trump praising progress in relations between the two countries and bringing up the possibility of another meeting between the two state heads.
Caskets that the US shipped to the border last month haven't been filled, despite Kim Jong Un's pledge during his June 12 summit with President Donald Trump to immediately repatriate identified remains.
In the letter, dated July 6, Kim recalled the historic meeting between the two leaders in Singapore on June 12, saying it was the start of a meaningful journey.
In it, Mr Kim says: "I deeply appreciate the energetic and extraordinary efforts made by Your Excellency Mr President".
Despite many nay-sayers there still appears to be hope for negotiations moving forward, as the North Korea Foreign Ministry made the statement last weekend, reported by the Independent that that the DPRK "still cherishes (their) good faith in President Trump".
But satellite images soon showed that North Korea was actually upgrading, not dismantling, its nuclear facilities, as noted in a separate Inquisitr report.
At high-level talks last week, North Korea and the US confirmed they are still poles apart on the next steps to be taken in the process.
A North Korean soldier marches at the truce village at the Demilitarized Zone (DMZ) which separates the two Koreas in Panmunjom, North Korea, Wednesday, June 20, 2018.
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While reports stated the return would not involve payment, other than reimbursement for the costs incurred in recovering and repatriating the remains, reference to payments may have displeased Pyongyang.
On Thursday, after he arrived in Britain following the North Atlantic Treaty Organisation summit, Trump disclosed that he had received a letter from Kim Jong-un.
Their meeting - the first between a sitting USA president and North Korea, led to claims that the latter would work towards dumping its nuclear weapons.
"Midday today they contacted us and offered to meet on Sunday", Ms Nauert said in a statement.
The search for fallen soldiers in North Korea has been halted for more than a decade amid tensions with the communist state. "It is likely that military generals from the US and North Korea will take part in the meeting".
"We were ready", the official said.
The Korean War was fought between South Korea and United Nations forces led by the U.S. on one side, and the North helped by China on the other.
Mr Pompeo travelled to Pyongyang for two days last week with the aim of fleshing out denuclearisation commitments, insisting the talks were making progress.
South Korean president Moon Jae-in said Friday he is confident a diplomatic thaw between Washington and Pyongyang will continue, despite "bumps and bruises" on the path to denuclearising the Korean peninsula.