Russia could build more Borei-class nuclear-powered submarine.

According to information published by Sputnik on May 19, 2021, Russia could build more Borei-A class strategic ballistic missile submarines after the ten submarines planned in accordance with the current contracts, Vladimir Pospelov, member of the Military-Industrial Commission under the Government of the Russian Federation.
Follow Navy Recognition on Google News at this link

K-549 Knyaz Vladimir Borei-A (Project 955A) class nuclear-powered ballistic missile submarine (Picture source: Russian MoD)

The Borei class, Russian designation Project 955 Borei and Project 955A Borei-A are series of nuclear-powered ballistic missile submarines being constructed by Sevmash for the Russian Navy. The Borei submarine is approximately 170 meters (560 ft) long, 13 meters (43 ft) in diameter, and have a maximum submerged speed of at least 46 kilometers per hour (25 kn; 29 mph).

Borei-A submarine is equipped with improved communication and detection systems, improved acoustic signature and has major structural changes such as addition of all moving rudders and vertical endplates to the hydroplanes for higher maneuverability, and a different sail geometry. This submarine is also equipped with hydraulic jets and improved screws that allows them to sail at nearly 30 knots while submerged with minimal noise. The Borei-A is able to carry 20 Bulava SLBM and is armed with 16 SLBMs with 6-10 nuclear warheads atop each, just like the Borei submarines.

The RSM-56 Bulava (NATO reporting name SS-NX-30 or SS-N-32, GRAU index 3M30, 3K30) is a submarine-launched ballistic missile (SLBM) based on the SS-27 Topol-M, developed for the Russian Navy and deployed in 2013 on the new Borei class of ballistic missile nuclear submarines. The missile is 12.1 m long and has a diameter of 2.1 m (including the launch container). It weighs a total of 36.8 metric tones and is capable of carrying up to 10 warheads with each warhead having a yield of approximately 550 kt. The Bulava’s range has been slightly reduced by 2,000 km from the land-based Topol-M variant due to its conversion from land-based to submarine-based.