Lost Cosmonauts
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Found this multimedia:
I don't know if it has been discussed here on ATS.

Are these audio files available from some other source to verify they have not been faked?

Copernicus, you're right. I apologize to have not provided other sources, so far.
This case has been discussed in the past, maybe not here.
This link should be useful

Notes on the space tracking activities and sensational claims made by the Judica-Cordiglia brothers (On File)

Laika (from Russian:, a breed of dog, literally: "Barker") was a Russian space dog which became the first living creature from Earth to enter orbit. At one time a stray wandering the streets of Moscow, she was selected from an animal shelter. Originally named Kudryavka, she was renamed Laika after her breed type. After undergoing training with two other dogs, she was selected to be the occupant of the Soviet spacecraft Sputnik 2 and was launched into space on 3 November 1957.

Laika died a few hours after launch from stress and overheating, probably due to a malfunction in the thermal control system. The true cause of her death was not made public until decades after the flight. Some former Soviet scientists have since expressed regret that Laika was allowed to die.[1]

Although Laika did not survive the trip, the experiment proved that a living passenger could survive being launched into orbit and endure weightlessness. It paved the way for human spaceflight and provided scientists with some of the first data on how living organisms react to spaceflight environments.

WIKIPEDIA

Space.com has the true story on Laika:The True Story of Laika the Dog

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