R-1 (de Havilland DH.4) in Mongolia, 1932.

Painting by O.Magmar of a R-1 in action during the Tauran incident of 1936. The painting shows the aircraft carrying the Mongolian ‘Zoyombo ’ markings, but this is considered to be artistic licence.

R-5s airborne, Mongolia, 1932.

Kalinin K-5, 1936.