US officials have been pressing Kim to free the three remaining American detainees as a gesture of sincerity before the summit, the first-ever meeting of sitting USA and North Korean leaders.
Noting that this was Kim's second trip to China in just over 40 days, Xi praised the state of "strategic communication" between China and North Korea, formally known as the Democratic People's Republic of Korea (DPRK).
The unannounced meeting is Mr Kim's second to China since March, and suggesting China does not want to be left outside while North Korea holds historic summits with South Korea's President Moon Jae-In.
Shortly after Xinhua's announcement, Trump tweeted that he would be talking to his "friend" Xi in the next hour.
However, the ties have been on a downhill since 2006 when the North conducted its first nuclear test despite giving assurance to China that it won't do so. A North Korean official on the Korean Central News Agency referred to the situation, stating "This act can not be construed otherwise than a risky attempt to ruin the hard-won atmosphere of dialogue and bring the situation back to square one".
Although there were no guarantees that the American prisoners would be freed during Pompeo's visit, United States officials said their release would be a significant goodwill gesture ahead of the Trump-Kim summit that is expected later this month or in early June.
Past trips by past North Korean leaders have also followed the pattern of being carried out quietly and only discussed after they are over. A status quo, it's worth noting, that means that the decades-long U.S. military presence in Korea will remain for decades more to come.
"So long as relevant parties eliminate hostile policies and security threats toward North Korea, North Korea has no need for nuclear (capacity), and denuclearisation can be realised", China's official Xinhua news agency cited Kim as saying.
Internet users in China said security was beefed up in Dalian and flight delays happened. Broadly speaking, recent developments between North and South Korea have been met with widespread optimism and praise from the South Korean public.
US officials say Pompeo will also press North Korea for the release of three detained American citizens, whose imminent release Trump has been hinting at.
China and North Korea fought side by side in the Korean War (1950-53), and remain close, but relations have been strained since the start of Pyongyang's nuclear programme, which Beijing fears has raised tensions on its borders.
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