Moon, South Korean first lady Kim Jung-sook, North Korean leader Kim and his wife, Ri Sol-ju, ascended Mount Paektu's highest peak, Janggun (9,003 feet), and viewed Cheonji crater lake on Thursday morning, realizing the President's long-held dream of reaching Mount Paektu's summit from the North Korean side.
However, their deal on the issue most fascinating and worrisome - the North's pursuit of nuclear-tipped missiles that can accurately strike the US mainland - contained a big condition: North Korean leader Kim Jong-un stated he would permanently dismantle his country's main nuclear complex only if the United States takes unspecified corresponding measures.
South Korean President Moon Jae-in made his first trip to the North Korean capital Pyongyang this week, where he convened yet another summit with leader Kim Jong-un, continuing denuclearization talks and diplomatic progress between the neighboring countries.
South Korea hosted the 2018 Winter Games in Pyeongchang, with athletes from the two countries forming a unified team.
Secretary of State Mike Pompeo on Wednesday invited North Korean Foreign Minister Ri Yong Ho for talks in NY next week, during the annual gathering of world leaders at the United Nations.
Despite the sound bites and photos that emerged from the third summit between the leaders of South Korea and North Korea, peace and denuclearization remain distant, experts said.
Mr Pompeo cited North Korean leader Kim Jong-un's decision to "complete the previously announced dismantlement of the Tongchang-ri site in the presence of USA and global inspectors as a step toward the final fully verified denuclearisation of North Korea".
The war ended in an armistice, rather than a peace treaty, meaning US -led United Nations forces, including South Korea, are technically still at war with the North.
Although Kim agreed to dismantle the Tongchang-ri missile test facilities, also known as Sohae, under the observation of global inspectors, "for the first time ... to witness the destruction".
Mr. Trump said they would wait and see what North Korea does next.
North Korea, South Korea agree on denuclearization plan, United States left out
Now he and Kim have a cordial relationship that included a "tremendous letter" from the North Korean leader this week, Trump said. And they agreed to "normalize the Kaesong Industrial complex and Kumgang tourism project as soon as the conditions allow".
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That's frustrating, associated with not playing well and not winning. I think this forum is a very professional one. I just don't believe it's appropriate.
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The North Korea ball is thoroughly back in Washington's court.
"The North Koreans are offering gestures that mimic disarmament", arms control expert Jeffrey Lewis tweeted. A peace treaty would also mean the withdrawal of United Nations observers from the 38th parallel and the dealing with the inner-Korean partition would be left completely up to the Koreas.
"Chairman Kim expressed his wish that he wanted to complete denuclearisation quickly and focus on economic development", Moon told a news conference in Seoul, shortly after returning from the summit with Kim in Pyongyang. They said the North was also willing to close its main nuclear complex if the United States took unspecified "reciprocal action". "We have lived together for 5,000 years and lived in separation for 70 years".
Now, the US appears ready to seize on Kim's new commitments, even if it's unclear how serious he is about them, and talks are back on. He said, "The era of no war has started".
The North Koreans said they want both sides to take a series of simultaneous steps as a "shortcut" to a nuclear-free Korean Peninsula.
The United States appeared eager to seize on commitments by North Korean leader Kim Jong Un at his talks with South Korean President Moon Jae-in even as critics said the steps did little to put Pyongyang on a course for irreversible denuclearisation.
"North Korea has sent the pine mushrooms with their heart". The ventures have the potential to violate global sanctions imposed on North Korea.
The most obvious candidate is Walkerhill, which is where Kim's sister stayed during her visit to Seoul.
Create rail and road links between North and South within the next year.
"They have continuously shown their trust towards one another and I hope there will be another summit between the two countries as soon as possible", Moon said.