During the Vietnam War, North Korean forces captured a U.S. Navy intelligence vessel and imprisoned 83 crew members who were released 11 months later.
The U.S. and South Korea also suspended a major joint military exercise that was planned for August in what was seen as a major victory for North Korea and its chief allies, China and Russian Federation.
During the visit, Kim and Xi are reported to have reached an understanding on the denuclearisation of the Korean peninsula after discussing the outcome of Kim's summit with U.S. President Donald Trump.
The Korean War, still technically unresolved, lasted from the summer of 1950 to the summer of 1953, and resulted in the death of over 36,000 US troops.
However, an unnamed USA official identified it on Wednesday as the Sohae Satellite Launching Ground, saying North Korea "has used this site to test liquid-propellant engines for its long-range ballistic missiles". But the precise number and the identities - including whether they are USA or allied service members - won't be known until the remains are tested.
The KCNA said that Kim appreciated China for providing strong support for making his summit with Trump a success, while reiterating the recently strengthened strategic cooperative ties between the two countries and vowing to advance such close and friendly ties going forward.
North Korea a year ago launched two missiles that flew over Japan.
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Not only did the North Korean leader met with President Xi Jinping, . he spent a fair amount of time touring Beijing's major city management and research centers.
The United States has identified the test site that President Donald Trump said North Korea promised to destroy.
"No matter the changes in the global and regional situation, China's party and government's resolute position on being dedicated to consolidating and developing Sino-North Korea relations will not change", the report cited Mr Xi as saying. -South Korean military exercises by the United States-which played right into the hands of the Chinese-promoted "freeze for freeze" strategy and cast doubt over American security guarantees to our allies across the region.
A North Korean shop, on the border between the two Koreas, usually sold souvenirs like postcards and stamps attacking the United States.
The pomp and circumstance looked geared toward showing off the major improvement in relations between the communist neighbours, along with China's important role in keeping North Korea on track.
If Kim's cozy China visit doesn't catch Trump's attention, that just might.
Kim said he would focus on the nation's economy and declared an end to testing of nuclear weapons and ballistic missiles.
Instead, the agreement merely reads, "Reaffirming the April 27, 2018 Panmunjom Declaration, the DPRK commits to work toward complete denuclearization of the Korean Peninsula".