A paramilitary policeman stands guard at Tiananmen Square in front of the Great Hall of the People in Beijing, China June 19, 2018.
Until recently Mr Trump had pursued a "maximum pressure" campaign - with both China and South Korea on board - of tough rhetoric and tightened sanctions against Pyongyang. On Tuesday, the USA and South Korean militaries confirmed they have called off upcoming joint exercises following Trump's order. "[We hope the visit will] strengthen strategic communication between the two sides on major issues to promote peace and stability in the region".
Ms Kang said it's a matter to be further discussed by experts. "Nothing has yet been decided, and it is still in discussion". "There will be a big question mark over whether China and the USA will continue this cooperation".
Accounts in South Korean media differ over who exactly proposed the latest measure, but it came at a general-level military dialogue, which hadn't happened for over a decade before.
But the guns represent a substantial part of North Korea's threat to Seoul.
According to the Russian foreign ministry, Pompeo also spoke about North Korea by telephone with Foreign Minister Sergei Lavrov. Some critics believe Trump made too many concessions and did not receive enough in return from North Korea.
Since he took over, Trump piled pressure on China to stringently implement the United Nations sanctions which many believe led to Kim agreeing to scale down his nuclear programme leading up to the summit with Trump.
Marines of the USA, left, and South Korea wearing blue headbands on their helmets, taking positions after landing on a beach during a joint military combined amphibious exercise in Pohang, South Korea.
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Trump Kim summit: North Korea sets out its Singapore agenda
But it is Mr Kim's pursuit of nuclear weapons that gives his meeting with Mr Trump such high stakes. Trump also flew into Singapore on Sunday, shortly after attending the Group of 7 summit in Canada.
"The Dokdo defence drill is a routine training conducted to prevent an invasion from external forces", said Choi Hyun-soo, a spokeswoman at Seoul's defence ministry. China is North Korea's most important diplomatic and economic backer but has been angered by Pyongyang's nuclear and missile tests.
Sun also said that when it comes down to ensuring economic sanctions stay in place, the United States seems to want China, along with Japan and South Korea, to do the "heavy lifting".
North Korea is estimated to have thousands massive artillery guns hidden in hardened shelters among the hills and mountains of the country's rugged terrain.
By organizing a second trilateral summit this year, China may want to demonstrate the partnership between the three Northeast Asian countries to the United States, as Beijing and Washington have been increasingly mired in a trade dispute. They had a phone conversation earlier in the day, during which they reaffirmed the importance of the allies maintaining close coordination on next steps.
Both Trump and President Moon are testing that possibility, their supporters say.
Beijing previously sponsored the now-defunct six-party talks on North Korean denuclearization, which eventually foundered.
The president may also have been responding to the American public, which appears to be withholding judgment on the long-term results of the summit. Susan Shand adapted it for Learning English.
VOA's Brian Padden reported this story. Mario Ritter was the editor.