Briz-M is a twin upper stage consisting of a core module (using Briz-KM as the baseline) and a jettisonable add-on toroidal tank surrounding the core. It is powered by a pump-fed gimballed main engine, the 14D30.
Briz-M is an upper stage composed of a core module (derived from Briz-KM) and an add-on toroidal tank surrounding the core. It utilizes a pump-fed gimbal-mounted main engine, the 14D30, for operation.