A draft design of a combined two-stage ballistic missile was developed at the Yuzhnoye Design Bureau under the leadership of Mikhail Yangel in December 1964.
It was assumed that the rocket would be equipped with a first stage with a solid fuel engine and a second ampulized stage equipped with a rocket engine.
The missile was placed in a transport and launch container.
For the first time for a ground-based missile was worked out
mortar launch from a transport and launch container using a powder pressure accumulator. This is the way when
which the main engine of the first stage is turned on at
height of 20-30 meters above the upper cut of the launcher
in order to reduce the destructive effect of the gas jet
a running main engine to the starting units.
It was envisaged to equip two types of head
parts: heavy, with a capacity of 1.5 Mt, and light, with a capacity of 0.5 Mt.
The estimated range of a missile with a heavy warhead was 5000 km, and with a light warhead, the intercontinental launch range was already achieved.
The project was closed in 1969 due to the difficulty of operating a rocket with containing both liquid and solid propellant.

music:
Paul Mauriat & James Last – Poljushko - Polje