They were known in the Soviet Union as Project 1159. 14 were built in Zelenodolsk shipyard between 1975 and 1988. They were originally intended to replace the older s, but were instead chosen as a design for export to various friendly navies.
In the Soviet Union, these vessels were known as Project 1159.  Between 1975 and 1988, 14 of them were built at the Zelenodolsk shipyard. They were initially intended to replace older ships but ultimately became a design for export to various friendly navies.