North Korea's Kim Jong Un arrives in Beijing for talks

A stretch limousine with a golden emblem, similar to one North Korean leader Kim Jong Un has used previously, is seen leaving the train station with a convoy in Beijing, China, Tuesday, Jan. 8, 2019. North Korean leader Kim Jong Un is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ng Han Guan)
In this Monday, Jan. 7, 2019, photo provided on Tuesday, Jan. 8, 2019 by the North Korean government, North Korean leader Kim Jong Un walks with his wife Ri Sol Ju at Pyongyang Station in Pyongyang, North Korea, before leaving for China. Kim left for China for a four-day trip, the North's state media reported Tuesday, amid speculation that he may attempt to coordinate his positions with Beijing ahead of his likely summit with U.S. President Donald Trump. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. Korean language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)
A stretch limousine with a golden emblem, similar to one North Korean leader Kim Jong Un has used previously, is escorted by motorcades as it heads towards Diaoyutai State Guesthouse in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Andy Wong)
A stretch limousine with a golden emblem, similar to one North Korean leader Kim Jong Un has used previously, leaves a train station with a convoy in Beijing, China, Tuesday, Jan. 8, 2019. North Korean leader Kim Jong Un is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ng Han Guan)
A beam of sunlight is cast on a Chinese paramilitary policeman stand guard on a roadside to maintain safety arrival for visiting North Korean leader Kim Jong Un, in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Andy Wong)
A stretch limousine with a golden emblem, similar to one North Korean leader Kim Jong Un has used previously, is escorted by motorcades traveling towards Diaoyutai State Guesthouse in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Andy Wong)
A sedan which is believed to carry North Korean leader Kim Jong Un leaves a train station with a convoy in Beijing, China, Tuesday, Jan. 8, 2019. North Korean leader Kim Jong Un is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ng Han Guan)
A train, at bottom center, similar to one seen during previous visits by North Korean leader Kim Jong Un arrives at Beijing Railway Station in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Mark Schiefelbein)
A train similar to one seen during previous visits by North Korean leader Kim Jong Un arrives at Beijing Railway Station in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Mark Schiefelbein)
A train similar to one seen during previous visits by North Korean leader Kim Jong Un arrives at Beijing Railway Station in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Mark Schiefelbein)
Police officers and police dogs sniff parked vehicles outside a train station before the arrival of North Korean leader Kim Jong Un in Beijing, China, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ng Han Guan)
People watch a TV screen showing file footage of North Korean leader Kim Jong Un and Chinese President Xi Jinping, right, during a news program at the Seoul Railway Station in Seoul, South Korea, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ahn Young-joon)
A train similar to one seen during previous visits by North Korean leader Kim Jong Un arrives at Beijing Railway Station in Beijing, Tuesday, Jan. 8, 2019. Kim is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Mark Schiefelbein)
A stretch limousine with a golden emblem, similar to one North Korean leader Kim Jong Un has used previously, is seen leaving a train station with a convoy in Beijing, China, Tuesday, Jan. 8, 2019. North Korean leader Kim Jong Un is making a four-day trip to China, the North's state media reported Tuesday, in what's likely an effort by Kim to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year. (AP Photo/Ng Han Guan)

BEIJING — North Korean leader Kim Jong Un arrived in Beijing on Tuesday at the start of a four-day visit, in what's likely an effort to coordinate with his only major ally ahead of a summit with U.S. President Donald Trump that could happen early this year.

A long motorcade including motorcycle outriders reserved for state leaders left a Beijing train station shortly after the arrival of an armored train consisting of 20 to 25 cars — most of whose windows were blacked-out —along tracks lined by police and paramilitary troops.

Kim's trip, announced earlier by both sides, comes after U.S. and North Korean officials are believed to have met in Vietnam to discuss the location of a second summit.

North's Korean Central News Agency said Kim departed Monday afternoon with his wife Ri Sol Ju and other top officials. It said Kim is visiting China at the invitation of Chinese President Xi Jinping. Tuesday also happens to be Kim's birthday.

China's official Xinhua News Agency issued a nearly identical report, while Beijing's North Railway Station was cocooned in security, with dozens of police and paramilitary troops patrolling outside.

Kim is expected to stay at the highly secure Diaoyutai State Guest House in the capital's west, with meetings held at the Great Hall of the People, the hulking seat of the legislature that sits next to Tiananmen Square.

The trip marked a further break with past practice in that it was announced in advance of Kim's arrival, a possible sign of growing confidence on the part of North Korea and China, Pyongyang's most important trading partner and a key buffer against pressure from Washington.

After years of cool relations following Kim's assumption of power 2011, ties have improved remarkably over the past year as Xi seeks to maintain his influence in the region.

Kim's trip comes as the U.S. and North Korea look to settle the North's decades-long pursuit of a nuclear arsenal.

Washington and Pyongyang seemed close to war at points during 2017 as the North staged a series of increasingly powerful weapons tests that got it tantalizingly close to its nuclear goal of one day targeting with pinpoint accuracy anywhere on the U.S. mainland.

Possibly fearing the economic effect of crushing outside sanctions imposed because of his weapons' tests, Kim abruptly turned to diplomacy with Seoul and Washington last year. He also visited China three times, notably without a reciprocal visit from Xi in a break with diplomatic convention.

But even after what was seen as a blockbuster summit between Kim and Trump in Singapore last June — the first-ever between the leaders of the war enemies — there's been little real progress in nuclear disarmament.

Washington is pressing the North to offer up a detailed accounting of its nuclear arsenal, while Pyongyang says it has already done enough and it's time for the U.S. to ease harsh international sanctions that hold back the North Korean economy.

Trump has offered assurances that another summit will allow he and Kim to make a grand deal to settle the nuclear standoff and change a relationship marked by decades of animosity and mistrust.

However, outside analysts are highly skeptical that the North will easily abandon a nuclear arsenal constructed in the face of deep poverty and likely seen by Kim as his only guarantee of regime survival.

Instead, Kim may be seeking to gauge China's attitude toward sanctions ahead of the talks, including what the North would have to concede in order to win Beijing's support at the U.N.

The North has held off on additional nuclear weapons and missile tests for more than a year, possibly in response to China's displeasure, while carrying out its new diplomatic offensive.

"The two leaders will further communicate over the issue of sanctions to further refine their previously general and vague attitudes," said Cheng Xiaohe, professor at Renmin University's School of International Studies in Beijing.

"It is impossible to see the cancellation of all sanctions, but what kind of sanctions can be cancelled and what are China and North Korea's views on that will be discussed," Cheng said.

Trump has pushed heavily for Chinese support in convincing North Korea to give up its weapons programs, suggesting that could win Beijing better terms in a trade deal with Washington.

Kim's arrival in Beijing coincides with U.S.-China trade talks in Beijing that seek to end the trade dispute between the world's two largest economies ahead of a March deadline.

Asked whether China was linking to issues in an interview Monday with CNBC, U.S. Secretary of State Mike Pompeo said: "The Chinese have been very clear to us that these are separate issues."

"Their behavior has demonstrated that as well and we appreciate that. China has actually been a good partner in our efforts to reduce the risk to the world from North Korea's nuclear capability. I expect they will continue to do so."

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Associated Press writer Foster Klug and Hyung-jin Kim contributed to this story from Seoul.

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