"One of my worries is that we come out of this Singapore summit with something that looks remarkably like the Six Party Talks or anything that the president has previously criticised but it is hyped as something that's historic and new and groundbreaking", he added.
Seoul says improved inter-Korean relations are important because North Korea wouldn't be willing to give up its nuclear weapons unless it feels its security has been assured.
Trump's two-day stop in Quebec for a meeting with the leaders of the Group of Seven industrial nations was exactly the fiasco many feared.
He was greeted by Singaporean Foreign Minister Vivian Balakrishnan as he stepped off his plane.
His sister and close aide Kim Yo Jong is also in Singapore, and is believed to have travelled separately on the ageing Soviet-made Ilyushin-62 that is Kim's personal aircraft.
They were given a "stern warning" before being expelled on Saturday, police said in a statement soon after North Korean leader Kim landed in the city-state.
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As Kim's black Mercedes arrived at the St Regis hotel in downtown Singapore, it was flanked by bodyguards in identical black suits jogging alongside the auto. Their hotels are cordoned off with heavy security.
When he arrived at around 3:40 p.m. local time (3:40 p.m. ET), Kim went straight to the hotel's elevators without acknowledging the crowd.
While Trump spoke positively about his upcoming meeting with Kim, he was vague on the details of what they might actually achieve. And he won't have that opportunity again.
The meeting was initially meant to rid North Korea of its nuclear weapons, but the talks have been portrayed by Mr Trump in recent days more as a get-to-know-you session.
"We have a very interesting meeting in particular tomorrow, and I think things can work out very nicely", he said.
Such a meeting was unthinkable just months ago when Trump and Kim were exchanging insults and threats that raised fears of war in the region.
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The cost of the summit for Singapore was some $15 million, Singapore Prime Minister Lee told reporters Sunday at the media center the city-state had constructed to deal with the enormous worldwide demand.
"It is our contribution to an global endeavour which is in our profound interest", he told reporters on Sunday.
She said the United States delegation would be led by Sung Kim, a veteran diplomat who recently held talks with North Korean officials.
"[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. "We appreciate the working together with North Korea".
USA and North Korean officials are set to meet Monday morning in Singapore to make final preparations for Tuesday's meeting.
The nuclear program has enabled Kim to project confidence, analysts say, and he is now trying to metamorphose from a nuclear-armed tyrant into responsible worldwide statesman.
The Awesome Adventures Of Captain Spirit Arrives June 26, 2018
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