President Xi Jinping issues warning to potential "invaders", saying Chinese and North Korean troops shattered "the myth of the invincibility of the US military" during the 1950-53 war between two Koreas and allies.
A group member's remark on promoting US-Korean relations referring to the Korean War provoked attacks from Chinese internet users and state media.
White House says Pyongyang has transferred the remains of an unspecified number of US soldiers killed in the 1950-53 Korean War to the United States.
The meeting in North Korea's Mount Kumgang comes as a part of efforts to improve relations between the two countries that had deteriorated over the North's nuclear and missile programmes.
The document signed in Singapore could mark a breakthrough, with N Korea's Kim Jong-un saying, "The world would see a major change" after his summit with US President Donald Trump.
There is no roadmap for peace or for denuclearisation on the Korean Peninsula as yet - and the devil is in the details. As the process expands to involve the US, there are a number of hurdles that can easily derail the highs of the peace declaration.
From Washington to Beijing, world leaders and governments praised Friday's historic inter-Korean summit, urging rival Koreas to step into more dialogue.
The leaders of the two Koreas in a bold bid for a lasting regional peace have promised to push for a formal end to the Korean War, and make the Korean peninsula free of nuclear weapons.
Tension on the flashpoint peninsula have showed signs of easing in recent months after the isolated, nuclear-armed North proposed summits with the South and their "imperialist enemy" the US.
A team of three officials will be led by Ri Son Gwon, the chairman of North Korea's committee for the peaceful reunification of the country, the North told its neighbour early on Saturday, the South's Unification Ministry said.
US Secretary of State Tillerson called to step up the US-led "maximum pressure" campaign against North Korea by thwarting sanctions evasion and interdicting ships conducting illicit trade with the nation.
US bombers flew off the east coast of North Korea in a show of force designed to project American military power in the face of Pyongyang's weapons programmes, escalating already sky-high tensions.
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