High Quality Content by WIKIPEDIA articles! The UR-100 (Russian: УР-100) was an intercontinental ballistic missile (ICBM) developed and deployed by the Soviet Union from 1966 to 1996. УР in its designation stands for "универсальная ракета" ("universal rocket"). It was known during the Cold War by the NATO reporting name SS-11 Sego and internally by the GRAU index 8K84.