Moon Jae-in, the South Korean president, will travel to Pyongyang on September 18 for a three-day summit with North Korean leader Kim Jong-un, his top aides confirmed on Thursday.
According to North Korean state media, Mr Kim vowed to "remove the danger of armed conflict and horror of war from the Korean peninsula and turn it into the cradle of peace".
The two past inter-Korean summits, in April and May, removed fears of war and paved way for the meeting between Kim and Trump in June.
"Chairman Kim Jong Un has made it clear several times that he is firmly committed to denuclearization, and he expressed frustration over skepticism in the global community over his commitment", Chung said.
Still, the South Korean envoy quoted the North Korean leader as saying he hoped to completely denuclearize and end the hostile relationship between his country and the US before Trump's first term ends in January 2021.
The statement Thursday from the Korean Central News Agency followed a high-level South Korean delegation's visit to Pyongyang to meet with Kim and to set up a summit later this month between him and South Korean President Moon Jae-in.
Chung quoted Kim as saying that two-thirds of each tunnel at the Punggye-ri nuclear weapons testing site had collapsed, rendering the tunnels permanently unusable. "But the work of convincing Chairman Kim to make the strategic shift that we've talked about for a brighter future for the people of North Korea continues".
The summit, from 18-20 September, will be the third inter-Korean summit this year.
"There is a still big gap between what the North considers sufficient goodwill gestures, like destroying its missile test stand or a nuclear test site, and what the United States wants, including on-site verification by experts", he said.
South Korea's liberal government is keen on keeping engagement with North Korea alive.
North Korea has long sought a formal end to the war but USA officials have said an end-of-war declaration could weaken North Korea's incentive for denuclearization, and raise questions about the 28,500 US troops stationed in South Korea, a legacy of the three-year war. The impasse between North Korea and the United States, with neither side seemingly willing to make any substantive move, has generated widespread skepticism over Trump's claims that Kim is intent on dismantling his nuclear weapons program.
Mr Kim was also pleased to receive a personal letter from Mr Moon, delivered by Mr Chung, KCNA added.
A peace declaration could put the U.S.in a tricky position.
Not only that they manged to hear directly from the regime's leader, where Pyongyang stands on denuclearization and peace efforts.
Under discussion is whether denuclearisation or declaring an end to the 1950-53 Korean War should come first.
Other North Korean officials and state-run media outlets have said negative things about a variety of other US officials recently, prominently including Secretary of State Mike Pompeo.
"It is the case that there is still an enormous amount of work to do", Pompeo told a news conference in New Delhi.