Mil Mi-6 "Hook," a Soviet heavy transport helicopter.
It was the first Soviet turbine-powered helicopter.
It was designed in the 1950s and entered production in 1957.
It could carry up to 61 passengers or 12,000 kg of cargo.
It set several world records for speed and weight-lifting.
About 800 to 900 were built and used in the Soviet Union and other countries.
Variants included passenger, fire-fighting, and command post versions.
The pictured aircraft is an Mi-6P passenger variant, registration CCCP-58647.