North Korean leader Kim Jong-un appears to have secretly left for Russia today for a summit with President Vladimir Putin, South Korean broadcaster YTN reported today, citing an unnamed senior government source.

Kim is seen crossing North Korea’s northeastern border on a special train, with the summit likely to take place as early as tomorrow, Tuesday, according to the YTN network.

The same source had earlier reported that the meeting between the two leaders could take place on Wednesday.

The trip, if confirmed, would be Kim’s first visit abroad in more than four years and his first since the COVID-19 pandemic.

His last trip abroad was in 2019, also to Vladivostok, for his first summit with Putin since North Korean denuclearization talks with former US President Donald Trump collapsed.

Earlier today, Russia’s Interfax news agency reported that Kim was expected to visit the Far East “in the coming days.”

South Korea’s foreign and unification ministries said they had no information to give. Officials at the National Intelligence Service were not available for comment.