Chinese President Xi Jinping has arrived for his first-ever visit to North Korea on Thursday, reported to a hero's welcome that included a 21-gun salute and a cheering crowd of thousands.
He arrived by plane at Pyongyang's Sunan International Airport around noon local time for his two-day summit with Kim, China's state-run Xinhua news agency reported.
Kim and his wife, Ri Sol Ju, personally greeted Xi and his wife, Peng Liyuan, on the tarmac, Xinhua said.
But the fact that Xi flew to North Korea is a difference between the two leaders that some say has embarrassed Kim in the past.
Though Kim flies domestically by plane – on a 40- year-old, Soviet-made Ilyushin Il-62 plane – he almost always takes a train for his international travels, even if his journey by several days.
The map below shows a 2,000-mile journey by train from Pyongyang to Hanoi earlier this year for his second summit with US President Donald Trump.
The one time Kim traveled out of his country by plane, at least as leader, was to Singapore last June for his first meeting with Trump.
To do so, he borrowed from Boeing 747 from Air China, which is majority-owned by the Chinese government. He had to borrow because of his own one was deemed unsafe for the 2,900-mile journey.
His use of a Chinese plane to his one-on-one meeting with Trump, which China did not attend, invited remarks that he was overly reliant on Beijing.
Kim did not appreciate those comments, The New York Times reported.
When he made his next major train journey, the Times cited Cheng Xiaohe, a North Korea expert at Beijing's Renmin University, on that point.
Cheng said: "He does not want to show the world his heavy reliance on China by his hand in front of China's national flag on a Chinese plane than he did at the Singapore airport."
"Traveling by train is a forced choice."
Read more: Inside Kim Jong's personal train – which is bulletproof, has all-white conference rooms, and his own red carpet ramp
A hero's welcome for Xi
Xi's trip to North Korea is the first from a Chinese leader in 14 years, and he was received like a hero.
According to Xinhua, North Korea held a "grand welcome ceremony" for Xi at the airport, which included a 21-gun salute, the playing of both countries' national anthems, and an army march-fit.
Nearly 10,000 people lined up at the airport, waving flowers, and chanting slogans to welcome the Chinese delegation, Xinhua said.
Xi then departed the airport in a huge motorcade, which included 21 motorcycles. Upon arriving to downtown Pyongyang, the Chinese leader then red an open-top car alongside Kim to a central square.
BBC Monitoring has published photos of Xi's welcome:
The state visit comes as both countries' relationships with the US turn increasingly sour.
Beijing and Washington are locked in a protracted trade war, which has seen both sides of hundreds of billions of dollars on each other's exports, and the Trump administration is trying to limit the influence of Chinese tech around the world.
North Korea's relationship with the US has also soured since Kim and Trump's February summit in Vietnam ended without an agreement.
Pyongyang conducted new missile tests last month, which US National Security Advisor John Bolton claimed violated UN Security Council resolutions.
On Wednesday both countries' state media published an essay, written by Xi himself, that lauded the two countries' friendship and praised North Korea for moving in the "right direction" by trying to resolve political issues on the Korean Peninsula.
wrote Xi, according to Xinhua: "I will pay a state visit to the DPRK with good wishes of carrying forward our friendship and writing a new chapter of our relations."
DPRK stands for the Democratic People's Republic of Korea, the formal name for North Korea.
Read more: Chinese President Xi Jinping praises North Korea ahead of his historic 2-day trip to Pyongyang – the first for a Chinese leader in 14 years
Kim has been trying to alleviate international sanctions But they have remained in place. China has committed to these sanctions despite being North Korea's largest trading partner.