Pravda report: Helicopter's crash on Kamchatka caused by violation of flying rules in mountainous area
The Mi-8 helicopter crashed on Kamchatka because its crew violated the rules of flying in the mountainous area, said Russian Emergencies Minister Sergei Shoigu on Tuesday, commenting on the results of the meeting of the state commission for investigating the causes of the crash.
"The crew flew on an impermissibly low height, lower than a safe height, and it did not take a decision to return or to stop the flight when the weather did not ensure the possibility to continue a safe visual flight. As a result, the helicopter clashed with the land," said the minister.
The helicopter crashed on August 20. Twenty people were on its board - seventeen passengers, including Sakhalin governor Igor Farkhutdinov, and three members of the crew. All of them were killed.
Source
I can't locate the actual aviation report. If they are made public, perhaps one of the Russian speaking among us could do a search.