The top US diplomat emphasised that complete, verifiable, irreversible denuclearisation "is the only outcome that the United States will accept" from North Korea, sending a stern message to Pyongyang before Tuesday's meeting in Singapore between US President Donald Trump and Kim Jong Un.
Trump and Kim arrived in Singapore on Sunday, both staying at luxurious and heavily guarded hotels less than half a mile apart, with Trump at the Shangri-La Hotel and Kim at the St. Regis Hotel.
The outlet also listed the individuals accompanying Kim to Singapore, including Kim Yong-chol, the US -designated terrorist whom Kim sent to the White House two weeks ago, and Kim Yo-jong, Kim Jong-un's sister, who made headlines attending the 2018 Winter Olympics in South Korea.
As the North Korean leader prepared for his meeting with US President Donald Trump, it appeared he had increased security which included taking his personal toilet on the flight.
North Korean leader Kim Jong-un walks out from the Marina Bay Sands during a city tour in Singapore.
Trump and Kim are slated to meet for "up to two hours" in private, with their translators present, before expanding the ambit of the summit to incorporate their respective lieutenants.
"I hope that a major agreement on ending hostile relations (between U.S. and North Korea) and the denuclearization of the Korean Peninsula is reached through this time's summit", Moon said. The agreement says nothing about verification or inspection systems to make sure North Korea actually gets rid of weapons.
North Korea must take "concrete" steps towards denuclearisation before benefiting from any relaxation of global sanctions, Downing Street has said.
While is it not news that North Korea's denuclearisation is likely to be the main agenda, Trump had last week said that the entire process of etching out a nuclear deal would take more than a single meeting.
Mr Trump descended from Air Force One into the steamy Singapore night, greeting officials and declaring he felt "very good" before being whisked away to his hotel via a route lined with police and photo-snapping onlookers.More news: Frank McKenna Says Trump's Treatment of Trudeau Is 'Appalling'
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The US President went for a lunch earlier today with Singapore's Prime Minister Lee Hsien Loong and even celebrated his birthday a couple of days early with a cake.
Tuesday's meeting will be the first between a sitting USA president and a leader of North Korea, whose nuclear and ballistic missile ambitions have raised global concerns and seen tensions soar.
In Seoul, President Moon Jae-in had a 40-minute phone call with Trump, after telling key aides that it could take "one year, two years or even longer to completely resolve the issues concerned".
The bodyguards first made an appearance in April when they were spotted during the Peace Summit in South Korea.
Part of the interest in Tuesday's summit is simply because Mr Kim has had limited appearances on the world stage.
The security guarantees could include an official declaration of an end to the Korean War, changes to the US-South Korea combined military exercises and lifting of economic sanctions, they added.
Iran said Monday that it remains dubious about the prospects for talks between the United States and North Korea, and warned Pyongyang to be highly vigilant about Washington's promises.
The motorcade carrying North Korean leader Kim Jong-un, drives past on the street in Singapore on June 10, 2018. 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.
Former Obama administration officials told NBC News that it is appropriate for the U.S.to not bring up human rights at the summit, but that the Trump administration should pursue the issue afterward.