North Korean leader Kim Jong Un told Chinese President Xi Jinping during talks in Beijing last week that he agreed to return to six-party talks on his nation’s nuclear program and missile tests, the Nikkei newspaper said on Thursday.

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 denuclearization.

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.

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