Complete, verifiable, irreversible denuclearisation on the Korean peninsula, or "CVID" - will there be any mention of this key USA demand when President Donald Trump and North Korean leader Kim Jong-un meet Tuesday?
Previous year the North carried out what was by far its most powerful nuclear test to date and launched a flurry of missiles - including two over Japan - while Trump threatened Pyongyang with "fire and fury" and Kim dubbed him a "mentally deranged US dotard".
North Korea news agency KCNA commented on Tuesday's agenda, saying talks would focus on "the issue of building a permanent and durable peace-keeping mechanism on the Korean peninsula, the issue of realising the denuclearisation of the Korean peninsula and other issues of mutual concern".
In response to a question from VOA News just before heading to Asia from the Group of Seven summit in Canada, Trump said "I really feel confident" about the unprecedented encounter between a sitting American president and a member of the family dynasty that has maintained iron-fist control over one of the world's most reclusive countries for three generations.
Chairman Kim yesterday held a meeting with Prime Minister Lee.
Kim arrived at Singapore's Changi Airport after his longest trip overseas as head of state wearing his trademark dark Maoist suit and distinctive high cut hairstyle.
The comment can be dismissed as casual optimism characteristic of the United States leader, but the watchers interpreted it as suggesting that the atmosphere in their last-minute negotiations on denuclearization may not be discouraging.
Meanwhile, President Trump arrived at Paya Lebar Airbase in Singapore in the evening and was also received there by the country's foreign minister Vivian Balakrishnan.
Observers in the region warn that ultimatums over denuclearization could make military confrontation between the US and North Korea even more likely, a situation Zhao Hai from China's Academy of Social Sciences described as a "down-spiral of security" that could turn into a nuclear "nightmare".
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Kim Yo Jong, the North Korean leader's sister, arrived aboard that jet.
"And he has that opportunity, and he won't have that opportunity again", Trump said.
Trump is set to meet with Lee on Monday.
Pompeo traveled twice to Pyongyang in recent months to lay the groundwork for Trump's meeting, becoming the most senior member of Trump's team to spend time with Kim face to face.
Likely to attend the summit with Trump are Pompeo, Bolton and White House chief of staff John Kelly.
Earlier Trump had said the meeting was a "one-time shot" for Kim. Past nuclear deals have crumbled over North Korea's reluctance to open its doors to outsiders.
During the meeting, the officials also celebrated Trump's birthday.
The previous USA stance, said Bruce Klingner of the Heritage Foundation, was that "we don't deploy a president to negotiate a treaty, we deploy a president to sign a treaty where we know where every piece of punctuation is on that piece of paper".
The fighting ended on 27 July, 1953, but the war technically continues today because instead of a difficult-to-negotiate peace treaty, military officers for the USA -led United Nations, North Korea and China signed an armistice that halted the fighting.
Fox News Host Sorry for Calling NoKo Summit Meeting of ‘Two Dictators’
Abby Huntsman apologised for her remarks, stating: "We all have slip ups in life". Let's see how this meeting with the two dictators , *cough* I mean leaders goes.