Reuters reports that Monday's talks are aimed at making final progress ahead of the Kim-Trump summit, .as the earlier meetings did little to narrow the gap between the two sides on the definition of Pyongyang's denuclearization.
The official said Trump and Kim would hold a one-on-one meeting on Tuesday that could last up to two hours.
The two leaders are expected to meet for up to an hour at the start of Tuesday's summit with just translators accompanying them, before the meeting widens to include advisors.
"When I woke up this morning I saw the news in the newspaper that our respected Marshal went to Singapore for the North Korea-U.S. summit", said Han Il Gwang, a Pyongyang resident, displaying typical discretion when speaking to an Associated Press Television crew.
Among those representing the U.S. at the lunch were Secretary of Secretary Mike Pompeo, White House Chief of Staff John Kelly and National Security Adviser John Bolton.
Formally ending the Korean War - 65 years after hostilities ceased with the signing of an armistice - will also be on the table at the first-ever meeting between a North Korean leader and a sitting American president.
Led by Sung Kim, a longtime State Department diplomat who now serves as the US ambassador to the Philippines, the USA team had held at least five sessions with the Pyongyang delegation over the past two weeks at the demilitarized zone in Korea.
Several of the reporters who accompanied Kim to Singapore had also been to the demilitarized zone between the two Koreas in April for the inter-Korean summit.
"Wide-ranging and profound views on the issue of establishing new DPRK-U.S. relations, the issue of building a permanent and durable peace-keeping mechanism on the Korean Peninsula, the issue of realizing the denuclearization of the Korean peninsula and other issues of mutual concern, as required by the changed era, will be exchanged at the DPRK-U.S. summit talks", a dispatch by the North's official Korean Central News Agency (KCNA) said.
Entire Hawaii neighborhood covered by lava
However, it was clear Monday that the vast majority of the approximately 500 homes in Kapoho Beach Lots and Vacationland are gone. Ige is coming to Hilo Thursday to meet with Kim, Snyder said, and the main focus will be on fast-tracking temporary housing.
A Trump administration official, speaking on condition of anonymity, said the USA side was entering the talks with a sense of optimism and an equal dose of scepticism given North Korea's long history of developing nuclear weapons. Both leaders were greeted on arrival by Singapore Foreign Minister Vivian Balakrishnan.
Trump initially touted the potential for a grand bargain with North Korea to rid itself of a nuclear missile program that has advanced rapidly to threaten the United States.
North Korean leader Kim Jong-un's sister Yo-jong gets into a van at the St. Regis Hotel in Singapore on Sunday.
Trump is set to meet with Lee on Monday.
Our Kim Hyo-sun tells us more.
Citing an unnamed USA government official, . The North Korean leadership, including Vice Minister of Foreign Affairs Choe Son Hui has also taunted Washington, calling Vice President Mike Pence a "political dummy".
It is the farthest Kim has travelled since inheriting power in 2011, and only his third known trip outside the country since then, with the use of a Chinese plane raising questions over the state of North Korea's ageing fleet of Soviet-built aircraft.
The jet landed at the airport Sunday afternoon amid huge security precautions on the city-state island.