The Sasha class is the NATO reporting name

NATO reporting name

NATO reporting names are classified code names for military equipment of the Eastern Bloc...

 for a class of minesweepers

Minesweeper (ship)

A minesweeper is a small naval warship designed to counter the threat posed by naval mines. Minesweepers generally detect then neutralize mines in advance of other naval operations.-History:...

 built for the Soviet Navy

Soviet Navy

The Soviet Navy was the naval arm of the Soviet Armed Forces. Often referred to as the Red Fleet, the Soviet Navy would have played an instrumental role in a Warsaw Pact war with NATO, where it would have attempted to prevent naval convoys from bringing reinforcements across the Atlantic Ocean...

between 1954 and 1956. The Soviet designation was Project 265

Design

The specification for the design was issued in 1946. The ships were steel hulled coastal minesweepers and were to replace wartime T301 class coastal sweepers. Following trials the bow shape was changed to improve sea-keeping and more advanced electronics and sweeps were introduced throughout the service lives of these ships.