UPDATE: TASS is reporting the primary payload, Kanopus ST, failed to separate from the upper stage. Efforts to correct the problem have reportedly failed.
Russian media are reporting that one of two military satellites placed into orbit by a Soyuz 2-1v rocket has failed to separate from its Volga upper stage after launch on Saturday from the Plesetsk Cosmodrome.
The Kanopus ST satellite includes sensors designed to track submarines, and the KYuA 1 secondary payload is a passive spacecraft that would be used to calibrate ground-based military radars. It’s unclear which spacecraft might still be attached to the upper stage.
This was the second launch for the Soyuz 2-1v, which successfully flew its maiden flight in December 2013. The rocket is a slimmed down version of the Soyuz 2 launcher, with the four booster rockets removed from the first stage and he NK-33 engine replacing the RD-117 motor. The launcher is capable of playing up to 2,850 kg into low Earth orbit.
TsSKB Progress, which manufactures the Soyuz 2-1v, began developing the Volga stage in 2008 as a cheaper alternative to the Fregat upper stage. The Volga is based upon a propulsion module that has been used on previous spacecraft. It successfully flew on Soyuz 2-1v first flight in 2013.