[1] Although these vessels were classified as frigates in the Soviet Navy, they were classified by the Indian Navy as anti-submarine corvettes due to their role and smaller size.

[2][3] The hulls of this class were of relatively inferior quality built only 5mm thick for use in the Baltic sea and Black seas, compared to the rest of the Navy's mostly British built ships which had 8mm thick hulls requiring the vessels to undergo major refit every 5 years to prevent corrosion.

The Indian Navy constructed the Naval Dockyard at Visakhapatnam, primarily to service Russian vessels.

But given the lack of engineering support from Russia there were inordinate delays in completing the servicing facility.

[4][5] The corvettes of this class constituted the 31st Patrol Vessel Squadron of the Eastern Naval Command and the 32nd Patrol Vessel Squadron of the Western Naval Command.