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.
These vessels were known as Project 1159 in the Soviet Union and were designed for export to allied navies.  They were originally intended to replace older models, but instead became a design for export.