Donald Trump has announced that Washington's chief diplomat, Mike Pompeo, is on his way to North Korea to prepare for a landmark nuclear summit between the United States president and his North Korea counterpart, Kim Jong-un.
Xinhua quoted Kim as saying North Korea would give up its nuclear weapons program if "relevant parties" drop hostile policies against Pyongyang.
In a cordial and friendly atmosphere, the two leaders had an all-round and in-depth exchange of views on China-North Korea relations and major issues of common concern, it said.
He said the two will discuss trade, an area where he says "good things will happen".
"China's top economic adviser, the vice premier, will be coming here next week to continue the discussions with the president's economic team". Shortly afterward, the White House released photographs of Pompeo and Kim posing for cameras.
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. The Trump administration has demanded that North Korea immediately commit to denuclearization.
There are no regular commercial flights between Dalian and North Korea and the airport was closed to other aircraft while the plane departed, NHK reported.
As with Mr Kim's March visit to Beijing, his presence in Dalian was not officially confirmed until he had left China.
The meeting between Kim and Xi came shortly after Kim's first two trips overseas since he became leader of North Korea in 2011. DPRK (Democratic People's Republic of Korea) is the official acronym for North Korea.More news: Brandon man killed in Maryland shooting
However, state broadcaster CCTV quoted Xi as saying China "supports North Korea to stick to denuclearization of the Korean Peninsula and supports North Korea and the U.S.in solving the peninsula issue through dialogue and consultation".
"If Japan-North Korea relations are normalized, that would greatly contribute to peace and security in Northeast Asia beyond the Korean Peninsula", he said in written answers to questions submitted by the newspaper.
The meeting, XI and Kim occurred on the background training of the North Korean leader for a historic summit with the USA leader Donald trump.
The March meeting was Kim's first global trip since he assumed power in 2011 following his father's death, and was seen as a warming of ties between the two fractious allies. Indeed, despite the short turnaround between Xi and Kim's meetings, there was a lot to catch up on.
In a text message to reporters, Moon's spokesman, Kim Eui-kyeom, said China had informed South Korea of the Dalian summit.
China has also been eager to assert its importance in the process of lowering tensions on the Korean Peninsula.
Speculation was ripe on Monday and Tuesday that Kim may have visited the Chinese city amid tightened security in Dalian, with Japanese media reporting that an airplane normally used by North Korean VIPs had arrived in Dalian.
The Chinese foreign ministry would not confirm or deny that a North Korean official had visited the country.