The leaders of North and South Korea have agreed to meet next month.
North and South Korea said in a joint statement that a meeting would be held on April 4 to discuss the details of the summit, including staffing, security and press relations.
"Through his summit with Kim, President Moon will seek to pave the way for having a successful summit between North Korea and the US", said Lee Jong-nam, a professor of political science at Korea University.
John Bolton, Trump's designated national security advisor, has supported this model as a way of resolving the North Korean nuclear crisis, and said that the Trump-Kim summit could be a "very short meeting" if Kim refused to agree.
"There's only a month left before the North-South summit", Ri told South Korean delegates to the meeting, "and during this short period, there are many things to discuss at the working-level". "We hope all South Koreans will be united in making a groundbreaking turning point for peace settlement on the Korean Peninsula at the summit". Those are: denuclearizing the Korean Peninsula, building a lasting peace with lowered tensions, and finally improving inter-Korean relations.
China's State Councillor Yang Jiechi arrived in Seoul on Thursday to brief Mr. Moon on Mr. Kim's visit to Beijing.
The North's commitment to stand down on nukes follows a busy year of a combined 17 full-flight missile tests last year, including one last September in which North Korea upped its game with its sixth and largest nuclear test to date.
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The South Korean delegation was led by Cho Myoung-gyon, the unification minister, while Ri Son-gwon, chairman of an agency that deals with inter-Korean affairs, headed the team of officials from North Korea. Xi reportedly told Kim that the bilateral relationship was strong because of generations of relying on each other and that "this should not and will not change because of any single event at a particular time", a sign that the Chinese are growing concerned that their role in containing North Korea is being eclipsed by Seoul and Washington. The two Koreas agreed Thursday that the three items should be taken up at the summit, but the topics couldn't be narrowed down any further.
This came after the two nations agreed on a rare summit that could prove significant in global efforts to resolve a decades-long standoff over the North's nuclear programme.
The summit will be seen as a victory for Moon, who has always been pushing hard for diplomatic relations with North Korea.
The leaders of the two Koreas have only held talks twice since the 1950-53 Korean War, in 2000 and 2007.
In his discussions with Mr. Xi, Mr. Kim reaffirmed his intention to meet with the two leaders, according to Xinhua, the Chinese state news agency.
The government of Kim Jong-un has informed leaders of North Korea's ruling Korean Workers Party of the possibility of summits with Japan, Russia and other countries, the newspaper said, citing an unidentified North Korean source and briefing papers.
Chinese President Xi Jinping promised Beijing would uphold its friendship with North Korea after his meeting with Kim.