The chopper crashed some 20 kilometers away from the town of Klin located to the north-west of the Russian capital. The aircraft fell in a deserted area, the military said, adding that the incident resulted in no casualties on the ground. 
The helicopter crew, which consisted of flight instructors and a group of trainees, suffered serious injuries and none of them survived, the ministry confirmed.

The helicopter was performing a regular training flight when the incident happened. The exact reasons of the crash are unknown but preliminary data suggests that it might have been caused by a technical malfunction.

A special investigative group of the Air Force major command has been dispatched to the crash site.

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