Soyuz-2.1v is a two-stage light-class, boosterless derivative of Soyuz-2.1b. It replaces the standard Soyuz core propulsion with an NK-33A main engine and RD-0110R steering engine, adapts the 2.1b third stage as its second stage, and can fly with the optional Volga upper stage for small-spacecraft missions from Plesetsk and Vostochny.