Months of chill between Beijing and Pyongyang appeared to suddenly vanish during Kim's secretive visit, with China saying that Kim had pledged his commitment to denuclearisation.
Quoting multiple sources connected to China and North Korea, the Nikkei said that, according to documents issued after Kim and Xi met, Kim told Xi that he agreed to resuming the six-party talks, which were last held in 2009.
North Korea declared the on-again, off-again talks dead at the time, blaming U.S. aggression. The talks grouped the two Koreas, the United States, Russia, Japan and host China.
The sources said it was also possible that Kim could convey his willingness to resume the talks to U.S. President Donald Trump at a summit set to take place in May, but that it was far from clear if that meant the talks would actually resume.
Chinese officials were not immediately able to comment.
North Korea has said in previous talks that it could consider giving up its nuclear arsenal if the United States removed its troops from South Korea and withdrew its so-called nuclear umbrella of deterrence from South Korea and Japan.
Some analysts have said Trump's willingness to meet Kim handed North Korea a diplomatic win, as the United States had insisted for years that any such summit be preceded by North Korean steps to denuclearise.
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