Experts say the more preferable outcome for China would be for Trump and Kim to sign a peace treaty that formally ends the Korean War and paves the way for the eventual withdrawal of the 28,500 American troops in South Korea. "We just hope President Trump knows what he was getting into".
At Seoul Station in the morning, busy passers-by stopped to watch the two leaders exchange the historic first handshake and opening remarks on television screens.
Japanese Foreign Minister Taro Kono is also heading to Seoul and is due to meet with Pompeo and his South Korean counterpart. Trump surprised allies by announcing the United States would stop holding military exercises with South Korea, a measure China first proposed to Washington previous year, known as the "freeze for freeze" initiative.
Chinese officials have been quick to take credit for some of the outcomes of a historic summit between the United States and North Korea on Tuesday. Kim said he held some hostility against the young communist leader before, but it dissipated when he saw Kim open to negotiations. But, Koreans are anxious they could be affected by the summit discussion.
Media captionTrump Kim summit: Win-win, or a Kim win?
"War games are very expensive", he said, raising the issue of their cost. During the Korean War, most of the missing Americans died in major battles, in aircraft crashes, or as prisoners of war. "I think this time what's different is we trust the two leaders, President Trump and Chairman Kim".
As tensions ease, and amid expectations that North Korea may open up, a few travel agencies Channel NewsAsia spoke to say there have been more who are interested in visiting North Korea.
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"Kim took selfies yesterday, and he is making some friendly gestures". And (Kim) was really very gracious.
"They didn't see it coming" and were "blindsided", Engel concluded.
"The fact that we are moving towards a peace agreement and denuclearization on the Korean peninsula - however slow that process might be - is tremendous progress", she said.
The presidential office said the measures were particularly needed at a time "when a variety of serious dialogues have been held between the North and the USA for the denuclearization of the Korean peninsula and the establishment of relations".
A South Korean official said he initially thought Trump had misspoken.
Tooth says North Korea's coal exports have nearly exclusively been to China due to the sanctions placed by most western nations.
Several reporters asked whether Mr Trump had raised the issue of human rights with Mr Kim, who runs a totalitarian regime with extreme censorship and forced-labour camps. The agreement ended following North Korea's development of nuclear weapons and safety issues surrounding the recovery teams sent from the U.S.to collect the remains, according to the Associated Press.