The Kashin class destroyers were a group of guided missile destroyers built for the Soviet Navy in the 1960s and early 1970s. Their Soviet Designation was Project 61. As of 2007, one ship is in service with the Russian Navy, and five modified ships are in service with the Indian Navy as Rajput class destroyers.
In the USSR they were officially classified as "guard ships" (storozhevoi korabl - SKR), then "large ASW ships" (BPK) or "large missile ships" (BRK), but in the rest of world they are commonly regarded as missile destroyers due to their size and armament. They were the first Soviet purpose-built anti-air warfare ships and the first to carry an ASW helicopter.
Provorny was converted in 1974-1977 to experimental Project 61E, with Volna launchers removed and single SA-N-7 Uragan SAM launcher fitted.