The officials inspected the station's building and a nearby bus station, briefly discussed something with Russian officials wearing military uniforms and left by a black jeep and white van with blacked-out windows escorted by police.

Officials also contacted with a North Korean cameraman, who was filming the surroundings of the station.

The cameraman, however, denied working for the North Korean state TV, when asked a relevant question by Sputnik, and provided no further comments.

On Tuesday, Kremlin aide Yury Ushakov said that Russian President Vladimir Putin and Kim would meet on April 25 in the eastern Russian city of Vladivostok. Ushakov noted that the talks would focus on a political and diplomatic solution to the nuclear problem of the Korean Peninsula.