Volga
From Spacefaring
Volga is a Russian rocket upper stage designed for use with the Soyuz-2.1a and Soyuz-2.1v rockets. It was derived from the propulsion module of the Yantar satellite, and is closely related to the retired Ikar upper stage. It serves as a lighter and more cost-effective alternative to the Fregat upper stage, used on most Soyuz-2 missions. RKTs Progress began development of the Volga in 2008 and the design was finalized in 2010.