Viktor Yanukovych Jr. has indeed died a tragic death, drowning under the ice on a frozen lake, Anton Heraschenko, an adviser to the Ukrainian interior minister, said on Facebook.

"Viktor Jr. wanted to drive on the surface of the frozen lake in a Volkswagen Multivan but he drove across the borderline between old and new ice, which was invisible under the snow. The vehicle started sinking under the ice, tilting on the driver's side. Eyewitnesses have told my source that Viktor was fastened in his seat when he drove on the ice and he lost the precious seconds he had to unfasten his seatbelt when the vehicle tilted on the driver's side. At that time, the driver's door could no longer be opened because it was pressed against the ice," the report says.

Yanukovych's son Viktor was born in Yenakiyeve in Ukraine's Donetsk region on July 16, 1981. He is a politician, was an MP of the fifth and sixth Verkhovna Rada, and holds a mastery certificate in car racing.

Ukrainian media reported earlier on Sunday that the former president's son Viktor Yanukovych had died after his car sunk on Lake Baikal in Russia.

The Baikal Rescue Service told Interfax earlier, meanwhile, that there was no one with the surname Yanukovych inside a car that fell through the ice on Lake Baikal in the Irkutsk region on Friday.

"Preliminary reports indicate that four Ukrainian citizens were rescued after the accident. The driver was a local resident. None of the rescued persons had the surname Yanukovych," a spokesman for the Baikal Rescue Service said.

A source in the regional emergency situations department told Interfax that the driver had not survived and that his name was Viktor Davydov.

The Irkutsk regional emergency situations department said on Saturday that police were investigating the death of a man in a car that had fallen through the ice on Lake Baikal.