Military autogiros, or autogyros.

[jcf]

That looks like a Kellet built under licence, or perhaps just copied in the Soviet way of those times. The rotor mast is very distinctive.

Comrade! More slurs on Soviet engineering genius 

The A-7 was developed by a TsAGI design team led by Kamov. Both TsAGI and Kellett began working on autogiros around 1929/30 and both started from licence built Cierva designs.

The A-7 design was started in 1931 and the prototype first flew in 1934. The first Kellett autogiro to have that shape of rotor mast was the KD-1 which also first flew in 1934 – perhaps the dastardly capitalists stole Kamov's design

The Soviet design was slightly faster – 221km/h for Za version as opposed to 210km/h for KD-1 and had a greater range – 400-600km depending on variant compared to 322km – and featured a tricycle undercarriage and a rotor which could be spun up to 195 rpm for a jump start. Za Rodinu!

The KD-1 was a direct-control autogiro, the A-7 was of the older C.19 Mk.IV type spindle/rotor-head design,
thus the wings which were still necessary, the direct-control types had no wings. The differences between the
early type and later direct-control autogiros are so great that direct comparisons are somewhat irrelevant.
Similar streamlining of the mast was due to the realities of aerodynamics.