Rockot was a three-stage expendable small launch vehicle derived from the Soviet UR-100N/SS-19 intercontinental ballistic missile. It reused the missile's two liquid-propellant lower stages with a restartable Breeze-KM upper stage for precise low-Earth and Sun-synchronous orbit insertion. Rockot flew civil and commercial missions from Plesetsk, including major ESA Earth Explorer and Copernicus payloads.