The press centre of the Main Department on Civil Defence and Emergencies reported RIA Novosti on a Mi-8 helicopter crash in the Leningrad region. The helicopter fell down near a village in the Volkhov district at 14.30 Moscow time on Friday.
According to preliminary data, some people were injured: one - badly and two - slightly.
The exact number of people aboard the helicopter is being specified.
The choice of the city of Helsinki is not incidental as the capital of Finland had hosted US-Soviet negotiations on the limitation of nuclear stockpiles in 1969