Kim Yong-guk, head of North Korea's Foreign Ministry's Disarmament and Peace Institute, articulated the state's position on the ministry's web site Tuesday.
During their Pyongyang visit, Moon's special envoys would discuss with the DPRK side a detailed schedule and agenda for the third Moon-Kim summit, which the two Koreas agreed to hold in Pyongyang before the end of September.
North Korea had also promised to dismantle its nuclear arsenal in return for a peace treaty with South Korea to definitively end the Korean War.
A high-level South Korean delegation will fly to North Korea this week to discuss arrangements for an inter-Korean summit there this month, as relations grow cooler between Washington and Pyongyang.
Amid faltering negotiations, North Korea has accused the United States of making "unilateral and gangster-like" demands on denuclearization and delaying a declaration on formally ending the war.
Trump called off a planned visit to North Korea by Secretary of State Mike Pompeo last month, citing insufficient progress in denuclearization.
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Kim said that declaring an end to the war is, above all, the first process in building trust between Washington and Pyongyang.
USA officials have insisted that a peace declaration, which many see as a precursor to the North eventually calling for the removal of all US troops from the Korean Peninsula, can not come before North Korea takes more concrete action toward abandoning its nuclear weapons.
Cheong Wa Dae officials have highlighted the importance of Moon's scheduled trip to North Korea and his meeting with the North Korean leader in kick-starting the denuclearization process.
A veteran North Korean official who was sanctioned for his suspected role in development of the country's nuclear and missile technology has died, the North announced on Tuesday (Sept 4).
"If inter-Korean relations also stagnate, the diplomatic momentum could be lost", he said in an interview.
They met a second time in Panmunjom in May as they scrambled to salvage plans for a summit between Kim and US President Donald Trump in Singapore, which eventually went ahead on June 12.