The Sonya class were a group 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...

 and Soviet allies between 1971 and 1991. The Soviet designation is Project 1265 Yakhont.

Design

A wooden hulled coastal minehunter, built as a successor to the Vanya class with new sweeps and more effective sonar. A central safe explosion proof area is fitted and all key systems can be remote controlled from there.

Ships

A total of 72 ships were built by Uliis yard in Vladivostok and Avangard yard in Petrozavodsk between 1971 and 1991. One ship, the BT-730 was lost in an accident in 1985 Another unit collided with a Swedish surveillance ship (HMS Orion) east of Gotland

Gotland

Gotland is a county, province, municipality and diocese of Sweden; it is Sweden's largest island and the largest island in the Baltic Sea. At 3,140 square kilometers in area, the region makes up less than one percent of Sweden's total land area...

 in the Baltic in November 1985.

Russian Navy

26 ships active with 14 in reserve

• Baltic Fleet
  Baltic Fleet
  The Twice Red Banner Baltic Fleet - is the Russian Navy's presence in the Baltic Sea. In previous historical periods, it has been part of the navy of Imperial Russia and later the Soviet Union. The Fleet gained the 'Twice Red Banner' appellation during the Soviet period, indicating two awards of...
  
   - 5 ships
• Black Sea Fleet
  Black Sea Fleet
  The Black Sea Fleet is a large operational-strategic sub-unit of the Russian Navy, operating in the Black Sea and the Mediterranean Sea since the late 18th century. It is based in various harbors of the Black Sea and the Sea of Azov....
  
   - 2 ships
• Northern Fleet - 8 ships
• Pacific Fleet - 8 ships
• Caspian Flotilla
  Caspian Flotilla
  The Caspian Flotilla is the oldest Russian military flotilla, stationed in the Caspian Sea. It was awarded the Order of the Red Banner in 1945.-Establishment:...
  
  - 3 ships