The sanctions "need to stay in place until North Korea verifiably and irreversibly dismantles its nuclear arsenal", said Andrea Berger of the Middlebury Institute of International Studies at Monterey. Kim is likely to leave this afternoon while Trump will depart tonight.
The US president said he had, and did not retract his description of Mr Kim as "talented".
It added that North Korea and the United States should take legal, institutional steps to guarantee it.
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5 latest North Korea summit developments: What you missed overnight
North Korea, it concludes, can only "actively contribute to world peace and human wellbeing", by engaging with other nations. When asked upon landing in Singapore how he was feeling about the encounter, Trump gave a brief answer: "Very good".
Speaking before US President Donald Trump and North Korean leader Kim Jong Un signed a "comprehensive" document following a historic summit in Singapore, Wang said China welcomed their talks and supported them.
A large contingent of Democrats criticized the president and his staff for tentatively granting a number of concessions to the North Koreans, including a pause on military exercises in South Korea and even meeting with Kim in the first place to lend his leadership legitimacy on the global stage. But the North has long sought an end to the U.S. military presence in the South, where Washington has around 28,000 troops stationed to protect it from its neighbour. "A leader I can do business with" under a picture of Trump and Kim shaking hands.
"I mean, this is what we have, and this is where we are, and I can only tell you from my experience, and I met him, I've spoken with him, and I've met him", Trump said, explaining he could only speak about his own experiences with the North Korean leader.
Trump initially rejected the proposal, in which North Korea would stop conducting nuclear and missile tests in exchange for a halt in military exercise between the USA and South Korea. "It's a win for Kim Jong Un".
It appears to reflect a new confidence among officials in North Korea that the country has really been accepted onto the world stage. "They are expressing their thoughts in order to cover their weaknesses".
The official newspaper of the Workers' Party of Korea featured 14 photos covering over half of the front page of its issue yesterday, showing a jovial Mr Kim walking with Singapore Foreign Affairs Minister Vivian Balakrishnan and other Singaporean officials at Gardens by the Bay and Marina Bay Sands hotel.