SECURITY CONCERNS Many questions remain unanswered, however, including whether the North Koreans have robust enough communication systems to make sure no one panics and launches an attack, said Vipin Narang, an associate professor at the Massachusetts Institute of Technology's Security Studies Program.
What did North Korea say?
Pompeo said he's received personal assurances from Kim that North Korea is ready to denuclearize. He had earlier been scheduled to leave on Wednesday.
The North Korean leader is expected to arrive at Changi on Sunday, a source involved in the planning of the trip told Reuters on Friday.
Kim also participated in a so-called "selfie" with Singapore's foreign minister, Vivian Balakrishnan, who uploaded the photo to Twitter.
It's not clear if he had shipped over the massive bulletproof and fireproof limousine that became a social media sensation when Kim was shown being driven across the border between the Koreas during his first summit with South Korean President Moon Jae-in, in April, with a dozen staunch bodyguards encircling the auto. Others complained about the jams in downtown Singapore.
"It's not like the Trump-Kim summit will solve everything", he added.
Mr Kim is staying at Singapore's five-star St Regis hotel, while Mr Trump is staying about half a mile away at the Shangri La.
The summit would discuss "building a permanent and durable peacekeeping mechanism on the Korean Peninsula, the issue of realising denuclearisation of the Korean Peninsula" and other issues "as required by the changed era".
North Korean leaders, who have been subject to some of the world's toughest ever sanctions, have long wanted to meet with the USA president, in part because of the worldwide legitimacy such a summit would provide.
He's also repeatedly expressed his support for a meeting between Trump and Kim - even offering to facilitate it or serve as an ambassador of sorts.
Just hours before what could be the most important meeting of his life, a seemingly relaxed and confident Kim Jong Un took a night on the town in Singapore, taking selfies and being greeted by cheering onlookers.
Tensions between the two countries escalated in 2017 after Pyongyang stepped up efforts to boost its nuclear weapons programme. They believe Kim's latest engagement is aimed at getting the United States to ease the crippling sanctions that have squeezed the impoverished country.
Kelsey Davenport, director for Nonproliferation Policy at the Arms Control Association, said there were signs that the gaps between the two sides were narrowing but there was also risk. The newspaper said the vehicles weren't from a local authorized dealer, which suggests the cars were brought in specifically for the summit and may be used by Kim.
"The process could be doomed before it begins".
Even those who are skeptical of North Korea's intentions don't want a return to last year's open hostility, when Trump and Kim were calling each other names and boasting about their nuclear buttons.
A third summit could then take place in Washington in September.
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