It all marks quite a turnaround from his threats a year ago, when he exchanged insults with US President Donald Trump and presided over North Korea's nuclear weapons programme, including the rumoured detonation of a hydrogen bomb.
The Kim-Trump talks will also give other clues as to the real face of a man who, until the Panmunjeom summit, had been more known for his ruthless dynastic dictatorship and pursuit of risky weapons than for openness and rationality.
"We talked a great deal about what it might look like, what this complete, verifiable, irreversible mechanism might look like", Pompeo said.
Later, at a joint news conference with the president of Nigeria at the White House, Trump said that Singapore and the Demilitarized Zone separating North and South Korea were on the short list of locations being considered for the summit.
Kim, the first North Korean leader to set foot in the South since the 1953 armistice that halted the Korean War, walked with Moon to the Peace House on the southern side of the border for their meeting. 216 individuals and 114 organizations, have been short-listed for the Nobel Peace Prize 2018.
Asked on CBS's "Face the Nation" whether the USA would make such a promise, Bolton said: "Well, we've heard this before". They very much want it.
Trump's predecessor, Barack Obama, won the 2009 Nobel Peace Prize just months into his presidency, an award many believed was premature, given that he had little to show for his peace initiative beyond his soaring rhetoric on the campaign trail.
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Seoul says North Korea has pledged to shut down its nuclear test site within weeks and invite American weapons experts to verify its closure.
The North's state news agency said the parliamentary move was made at the proposal of Kim, who found it was "a painful wrench to see two clocks indicating Pyongyang and Seoul times hanging on a wall of the summit venue".
However, Kim has kept up his charm offensive, and Pyongyang has now said it would reset its clocks by half an hour on Saturday to realign with the South.
Over the weekend, Defense Secretary Jim Mattis, after speaking with his South Korean counterpart, reaffirmed "the ironclad USA commitment" to defend the longtime US ally "using the full spectrum of US capabilities".
It is still not confirmed if Trump, Kim Jong-un, and Moon Jae-In, are in the race as a team or individually.
At the same time, relations have become somewhat strained over North Korea's nuclear weapons programme, as China fears it will bring instability to the region and could boost the standing of the USA in Asia through its ally South Korea.