Earlier in the day, an emergency services source said 21 people had been killed in the crash and one survived.
Rescue teams have found both black boxes of the helicopter, according to the emergency services source.
"Both black boxes have been found — a flight data recorder and a voice recorder. After investigative procedures, they will be sent for decryption," the source said.
The transport helicopter was carrying 22 passengers and three crewmembers when it crashed roughly 82 kilometers northwest of Old Urengoy in the Yamalo-Nenets Autonomous early Saturday morning region due to poor weather conditions.
A search and rescue group rushed to the scene.
Earlier reports suggested that between three and five people may have survived the crash, but it now appears that only one has survived.
