The Kamov V-80 eventually evolved into that single seat Russian attack helicopter?
Kamov V-80: The Kamov V-80 was a design study designation for an attack helicopter that eventually evolved into the single seat Kamov Ka-50 family of aircraft. Kamov Ka-50: The Kamov Ka-50 "Black Shark" (Russian: "Чёрная акула"; "Chornaya Akula" , NATO reporting name: Hokum A) is a single-seat Russian attack helicopter with the distinctive coaxial rotor system of the Kamov design bureau.
Kamov Ka-50