The Kremlin on Monday announced that Putin would travel to Vladivostok for an economic forum. The office said the two leaders would meet in the coming days, but didn't offer specifics about the timing or location of the summit.

U.S. officials said discussions have advanced between the two countries about a possible plan for North Korea to supply weapons to Russia.

\"PHOTO:
AP
PHOTO: In this photo taken from video released by telegram channel @primamedia on Tuesday, Sept. 12, 2023, a green train with yellow trimmings is seen steaming near Khasan, about 79 miles south of Vladivostok, Russia Far East.
>

Kim's train departed Pyongyang on Sunday, beginning its journey to Russia for a planned meeting with President Vladimir Putin, a South Korean official told ABC News.

\"Our Dearest Comrade Kim Jong Un will be visiting Russia upon invitation from Russian President Vladimir Putin. During the visit he will meet Putin and hold a summit,\" the Korean Central News Agency reported Monday.

South Korean officials said the train was expected to cover the about 683 miles to Vladivostok in about 20 hours, a timeline that included with a long stopover at the Russia-North Korea border, needed to switch to wheels that would fit Russian railway tracks.

\"PHOTO:
Korean Central News Agency via AP
PHOTO: This Sept. 10, 2023, photo provided by the North Korean government shows that North Korea leader Kim Jong Un waves from a train in Pyongyang, North Korea, as he leaves for Russia.
>

Kim has rarely left North Korea since he took power in 2011. His most recently documented international trips were in 2019, a year in which he stepped over the border to visit with then-President Donald Trump and traveled via train to Russia.

When he does travel, he prefers to do so via the rails in the heavy and slow-moving bullet-proof train, as his father and grandfather did when they were in power, NPR reported.

ABC News' Ellie Kaufman and Joohee Cho contributed to this report.

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