Died record holder for the duration of the flight in space Valery Polyakov

This is stated on the Roscosmos website.

Polyakov is the holder of the world record for the longest space flight - 437 days.

As specified, the astronaut has two space flights, he spent in space in total more than 678 days.

In early June, twice Hero of the Soviet Union cosmonaut Valery Ryumin died.

He was 82 years old.