In 2013, two ships of project 21631 were built in Zelenodolsk - the lead “Grad Sviyazhsk” and the first serial “Uglich”, which successfully completed state tests on the Caspian Sea. At the end of 2013, the State Commission signed acts on their acceptance. At present, Zelenodolsk Plant named after A.M. Gorky "is building four more ships" Buyan-M "-" Great Ustyug "," Green Dol "," Serpukhov "and" Vyshny Volochek ". RTO "Great Ustyug" launched in early May of this year. The ship’s crew arrived at the plant, which masters modern weapon systems, ship systems and mechanisms, and also prepares the ship for transfer to the Caspian Sea for state tests and transfer the fleet.
The Russian Defense Ministry signed a contract with OAO Zelenodolsk Plant named after A.M. Gorky "on the construction of four additional ships project 21631 25 December 2013 of the year.