"Today is a great day for everybody".
There was no word on how Trump was spending the night before the summit. Again accusing the longtime USA ally of unfair trade practices, Trump added: "Then Justin acts hurt when called out!"
Summit venues and travel are also being protected by Singaporean police, Reuters reports.
Each plans to leave Singapore hours after their meetings wrap up, though Trump plans to speak to reporters about the developments. "I could see Trump giving up a lot for very little in return".
But enough about that - check out Trump's power move in the initial handshake.
A jet carrying Kim landed hours earlier.
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Kim smiled broadly Sunday evening as he met with Singapore Prime Minister Lee Hsien Loong.
"The entire world is watching the historic summit between (North Korea) and the United States of America, and thanks to your honest efforts. we were able to complete the preparations for the historic summit", Kim told Lee through an interpreter.
Trump has said he hopes to make a legacy-defining deal for the North to give up its nuclear weapons, though he has recently sought to minimize expectations, saying more than one meeting may be necessary.
Kim is widely believed to be a fan of the 1990s Chicago Bulls.
Kim said he wanted to express his gratitude to President Trump for making the meeting happen. The front page of the Rodong Sinmun, the ruling party newspaper, was covered in pictures of the leader's late-night stroll through the bright lights of downtown Singapore.
It's not clear what the U.S. side has been able to extract from the North Koreans in terms of their willingness to get rid of their nuclear weapons or allow inspectors into the country to catalogue the scale of their program.
Kim Jong Un poses for a selfie with Singapore Foreign Minister Vivian Balakrishnan and Education Minister Ong Ye Kung.
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Trump vowed to prevent that happening and threatened North Korea with "fire and fury like the world has never seen".
Staff-level meetings between the United States and North Korea were going "well and quickly", Trump said in a message on Twitter on Tuesday.
Trump gives his trademark thumbs up to a grinning Kim.
A United States official confirmed to CNN Trump's departure was moved up by more than 12 hours because Kim set his own departure for shortly after the summit, as first reported by Bloomberg. The war was concluded with a truce, not a peace treaty, but a treaty will also have to include China, which was party to the armistice.
The Swiss-educated leader, who is believed to be 34, has not left his isolated country since taking office in 2011, apart from visiting China and the South Korean side of the border Demilitarised Zone, which separates the two Koreas. After a one-on-one meeting and a working lunch, Trump showed Kim the inside of his presidential vehicle.
Participants in a mass rally gather in Kim Il-Sung Square in Pyongyang on September 23, 2017.
Any nuclear deal will hinge on North Korea's willingness to allow unfettered outside inspections of the country's warheads and nuclear fuel, much of which is likely kept in a vast complex of underground facilities. That could generate misunderstandings and a breakdown that risks armed conflict over North Korea's nuclear weapons.
Some Facts About the Upcoming Kim-Trump Summit
He also shared a photo of himself and Trump and told the entire world that he's "honored" to call the president a friend. Hyon is head of North Korea's hugely popular Moranbong girl band, whose members were hand-picked by Kim Jong Un .
"A complete and verifiable and irreversible denuclearization of the Korea Peninsula is the only outcome that the United States will accept", Pompeo said.