(ATTN: RECASTS headline, lead; ADDS more info throughout, photo)
SEOUL, Jan. 8 (Yonhap) -- North Korean leader Kim Jong-un is on a trip to China for talks with Chinese President Xi Jinping, state media reported Tuesday, raising speculation that his second summit with U.S. President Donald Trump might be forthcoming.
Kim and his wife, Ri Sol-ju, left for China on Monday afternoon for a four-day visit at the invitation of the Chinese president, Pyongyang's Korean Central News Agency said. China's Xinhua news agency also confirmed his visit.
Kim was accompanied by party, government and military officials, including Kim Yong-chol, a key nuclear negotiator with the U.S., and Ri Yong-ho and No Kwang-chol, the country's foreign and defense ministers, respectively, according to the KCNA.
The confirmation of Kim's trip to China came after South Korean media earlier reported that a special train carrying a high-ranking North Korean official crossed into China on Monday night.
It was Kim's fourth trip to the neighboring ally and came as Washington and Pyongyang are in talks to set the venue for a meeting between Kim and Trump.
Kim is widely expected to discuss with Xi his possible second summit with Trump.
Last year, Kim traveled to China and met with Xi three times before and after he held his first-ever summit with Trump in June in Singapore.
In the Singapore summit, Kim agreed to work toward complete denuclearization of the Korean Peninsula in exchange for security guarantees and new relations with the U.S.
Progress, however, has been slow in denuclearization for months as the North calls for sanctions relief, while Washington says such concessions would not be granted until the North completely gives up its nuclear weapons.
In his New Year's speech last week, the North's leader warned that he could take a new way if the U.S. clings to pressure and sanctions on its regime. He still kept the door open for talks with the U.S., saying he is willing to meet Trump at any time.
He also called for multilateral talks involving the signatories to the truce that ended the 1950-53 Korean War, including China, and replacing it with a peace treaty. The issue could be discussed during his trip to China this week, observers said.
Trump earlier said that the U.S. and North Korea are in talks over where to hold their second summit, adding that the decision on the venue will be announced in the "not-too-distant future."
Experts see Kim's trip to China might be intended to demonstrate to the world that their relations remain strong and also reflect the North's push to project its image as a normal state.
"It is rare that the North's leader travels overseas at the start of the year. (His trip to China) shows how important it is to advance relations between the North and China," Yang Moo-jin, a professor at the University of North Korean Studies, said.
"It is also aimed at showing off the image of a leader of a normal state," he added.
Xi is expected to visit North Korea soon as the two countries mark the 70th anniversary of establishing diplomatic ties this year.
Experts say that Kim's trip to China could be followed by his visit of Seoul or meeting with U.S. President Trump as early as February.
Kim agreed to travel to Seoul for the first time as a North Korean leader "at an early date" during his summit meeting with South Korean President Moon Jae-in in September.
In a personal letter to Moon last month, he expressed disappointment for not making a trip to Seoul by the year's end and hoped to fulfill his promise soon.
(2nd LD) S. Korea moves to limit classroom crowding amid persistent outbreak in capital area
S. Korea to test QR codes at nightclubs, eateries, cinemas to contain virus
Greater Seoul area continues to see double-digit rise in infections
S. Korea unveils new quarantine guidelines for everyday life
(LEAD) Logistics center-linked virus cases snowball to 69, emerging as another cluster in greater Seoul
Sampling blunder by BTS member serves as cautionary tale for K-pop act going forward
(4th LD) S. Korea again gripped by church-linked cluster infections in greater Seoul area
Surprise transport onto THAAD base sparks suspicions over upgrade or additional deployment
Church-tied virus cases on steady rise ahead of further school reopenings
'D-2' by BTS' Suga debuts at No. 11 on Billboard 200