BEIJING—North Korean leader Kim Jong Un has reportedly told the leader of his only major ally, China, that he wants to “achieve results” on the nuclear standoff on the Korean Peninsula in a second summit with U.S. President Donald Trump.

The comments, contained in reports Thursday from Chinese and North Korean state media, came a day after Kim left Beijing on his special armoured train for Pyongyang after a two-day visit to the Chinese capital.

Kim’s trip to China — his fourth in the past 10 months — is believed to be an effort to co-ordinate with Beijing ahead of a possible second summit with Trump. It comes after U.S. and North Korean officials are thought to have met in Vietnam to discuss the site of the summit.

North Korea will “make efforts for the second summit between (North Korean) and U.S. leaders to achieve results that will be welcomed by the international community,” Kim was quoted as saying by China’s official Xinhua News Agency.

All sides should “jointly push for a comprehensive resolution of the Korean Peninsula issue” and North Korea would “continue sticking to the stance of denuclearization and resolving the Korean Peninsula issue through dialogue and consultation,” Xinhua quoted Kim as saying.

Kim also said North Korea hopes its “legitimate concerns” would be given due respect, a reference to Pyongyang’s desire for security guarantees and a possible peace treaty to formally end the 1950-53 Korean War.

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He also credited President Xi Jinping with helping reduce regional tensions, saying “the Korean Peninsula situation has been easing since last year, and China’s important role in this process is obvious to all.”

It wasn’t clear from the reports if Kim was in back in the North, but his train presumably would arrive sometime Thursday.

Xi was quoted as saying that China supports the U.S.-North Korea summits and hopes the two sides “will meet each other halfway.” The North said in its report that Xi accepted an invitation to visit North Korea, although details of when he might come were not given.

Xi has yet to visit North Korea since taking office in 2012.

Trump and Kim met in Singapore in June for the first-ever leaders’ meeting between their nations, but there has been a standoff ever since, with dueling accusations of bad faith.

Kim’s Beijing visit was seen as part of an effort to win Chinese support for a reduction of U.N. sanctions imposed over his nuclear weapons and ballistic missile programs, which have severely impacted his country’s already ailing economy.

While North Korea hasn’t conducted any launches or detonations in more than a year, it’s displayed no real intention of abandoning the programs that are seen as guaranteeing the government’s survival.

The trip also came after he expressed frustration in his annual New Year’s address over the lack of progress in negotiations with Washington since the Singapore summit, saying that if things don’t improve — meaning that if sanctions relief and security guarantees aren’t in the offing — Pyongyang might have to find “a new way” forward.

While Trump says he considers Xi key to enticing Kim into taking concrete steps toward denuclearization, the president’s own relationship with his Chinese counterpart has frayed over the U.S.-China trade war.

Officially, at least, China says it considers the tariff battle and North Korea’s weapons programs to be entirely separate.

South Korea’s Yonhap News Agency said Kim visited a technology development zone on the outskirts of Beijing on Wednesday and spent around 20-30 minutes touring a factory run by famed traditional Chinese medicine maker Tong Ren Tang.

Yonhap said Kim met with Xi for about an hour on Tuesday and later attended a dinner at the Great Hall of the People in central Beijing hosted by Xi and his wife, Peng Liyuan. Kim was accompanied by his wife, Ri Sol Ju, the news agency said.

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At Tuesday’s daily Foreign Ministry briefing, spokesman Lu Kang said Beijing remains supportive of efforts to end tensions over U.S. demands for a halt to North Korea’s nuclear and missile programs.

“We always believe that, as key parties to the Korean Peninsula issue, it’s important for the two sides to maintain contact and we always support their dialogue to achieve positive outcomes,” Lu said.

Tuesday was Kim’s birthday but there was no word of any official celebrations.

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