Few people expect Kim to commit to what some Trump administration officials call "CVID:" Complete, verifiable, and irreversible dismantlement of nuclear weapons programs - certainly not at this meeting, and perhaps not ever.
According to accounts of the G-7 meeting, officials from other members of the bloc confronted Trump with a torrent of statistics about the importance of the USA -authored global order and the merits of free trade.
Trump arrived a few hours after Kim on Air Force One, directly from a tumultuous G7 summit in Quebec, which ended in a bitter personal exchange between the USA president and the host, the Canadian prime minister, Justin Trudeau.
Trump, who is offering to reduce economic sanctions on North Korea in exchange for denuclearization, also seemed to warn Kim that the summit is a "one-time opportunity" that should not be wasted.
After meeting privately and with aides, Trump and Kim moved into the luncheon at a long flower-bedecked table.
President Donald Trump has arrived at Singapore's government house for a meeting with the island city-state's leader.
Yet he has conceded that even the most successful one-day summit is unlikely to achieve his ambition of persuading Kim to give up his nuclear arsenal, at least anytime soon.
The US president will arrive later on Sunday.
Officials remain uncertain what will come out of Tuesday's unprecedented summit, the first of its kind between a sitting USA president and the leader of North Korea.
Ahead of his much-anticipated meeting with Kim Jong Un, U.S. President Donald Trump paid a courtesy call to their Singaporean host. "Why would Kim. believe any commitments President Trump makes when he arbitrarily tears up an agreement with which the other party is complying?" said Antony Blinken, who was deputy secretary of state under Barack Obama.
North Korea declared itself a nuclear power in 2005.
"[President Trump] is not going to permit any show of weakness on the trip to negotiate with North Korea", Kudlow said on CNN's State of the Union.
WALL STREET: U.S. stocks ended higher Friday, led by consumer products and health care companies.
Under Kim, Pyongyang has made rapid progress in its weapons technology, carrying out by far its most powerful nuclear test to date a year ago and launching missiles capable of reaching the U.S. mainland.
Lee has said the summit would cost Singapore about S$20 million ($A19m), more than half of which would go on security. The meeting was initially meant to rid North Korea of its nuclear weapons, but the talks have been portrayed by Trump in recent days more as a get-to-know-you session. He has also raised the possibility of further summits.