The Krivak class, Soviet designation Project 1135 Burevestnik, are a series of frigates and patrol ships built in the Soviet Union primarily for the Soviet Navy since 1970. Later some sub-branches, like the Nerey (Nereus) were designed for coastal patrol by the KGB Border Troops. Until 1977, the ships in the class were considered to be large anti-submarine warfare vessels.

The Riga class was the NATO reporting name for class of frigates built for the Soviet Navy in the 1950s. The Soviet designation for these ships was Storozhevoi Korabl Project 50 Gornostay. The Riga class was analogous to World War II era destroyer escorts.