The R-39 Rif (NATO reporting name: SS-N-20 Sturgeon; bilateral arms control designation: RSM-52 ) was a submarine-launched ballistic missile (SLBM) that served with the Soviet Navy from its introduction in 1983 until 1991 after which it served with the Russian Navy until 2004. The missile had GRAU indices of 3M65 3M20 and 3R65.
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