The R-9 (Russian: Р-9; NATO reporting name: SS-8 Sasin) was a two-stage IRBM of the Soviet Union, in service from 1964 to 1976.

Previous Soviet designs, fuelled with cryogenic LOX and kerosene, commonly took hours to fuel and launch.

"Valley", the first of two above-ground launch sites, was mostly automated and could fire the R-9 within 20 minutes as well, and repeat the process within two and a half hours.

SS-8 Sasin is a NATO reporting name that was mistakenly applied to two different Soviet missile systems.

The crew was descending to the eighth level in a lift when a spark from an electrical panel started a fire in the oxygen-enriched atmosphere, killing seven and destroying the silo.