North Korea is now under both worldwide and unilateral USA sanctions for its nuclear and missiles tests.
"I think China may be concerned about losing their leverage over North Korea and fears that North Korea and the U.S. may enter into an anti-Chinese alignment", said Charles Armstrong, a historian on Korean affairs at Columbia University in NY.
In follow-up talks on the establishment of new relations, the USA and North Korea will likely hold discussions on ending hostilities.
During the first press conference after his historic meeting with the North Korean leader, Trump said United States war games in the region would be "provocative" amid talks with Pyongyang and promised to suspend them.
According to the Defense Department's POW/MIA Accounting Agency, more than 7,800 Americans have not been accounted for from the war, and about 5,300 of that total are believed to have been lost in battle in North Korea or buried at prisoner-of-war camps.
Kim said he is destroying a major missile engine testing site.
"The Singapore summit statement is essentially aspirational: no definitions of denuclearisation, no timelines, no details as to verification", Haass said on Twitter.
Terminating the 1950-1953 Korean War that ended in an armistice had been discussed another part of means to guarantee North Korea regime security, but this was not included in the agreement. The talks ultimately imploded over differences on a verification regime, and North Korea formally withdrew from the negotiations after it launched a long-range rocket, prompting worldwide outrage.
France's Emmanuel Macron Throws Down Trump Twitter Gauntlet: G7 Can Be G6
He added: "The six countries of the G7 without the United States are a bigger market taken together than the American market". A net importer of USA steel, Mexico is also putting 25 percent duties on a range of American steel products.
Supporters of Tuesday's agreement say it serves as a starting point for more meaningful discussions. "The Security Council's actions should support and conform to the efforts of current diplomatic talks towards denuclearizing the Korean peninsula, and promote a political solution for the peninsula". "The real test of "success" will be whether the two sides can transform the bold commitments into concrete, steady progress in the weeks and months and years ahead".
He lionised Trump for achieving "a feat that no one else has ever delivered", adding Kim would also be remembered as "a leader who made a historic moment by taking the first bold step toward the world".
Hours after talks between North Korean leader Kim Jong Un and U.S. President Donald Trump in Singapore, Chinese foreign ministry spokesman Geng Shuang said the Security Council's sanctions against North Korea were created to be adjusted and could be suspended or lifted in accordance with the North's actions.
"It marks the beginning rather than the culmination of a process", said Snyder.
"Sanctions are not an end", he said.
"It's a victory for North Korea, in having initiated an open-ended, drawn-out negotiation process that ensnares the US into not enforcing sanctions", said Lee.
"This hollow, nonbinding joint statement allows Trump to walk away from it, because there's nothing to walk away from", said Lee.