Izvestia reports that the Russian Navy will test modular weapon systems and equipment that can be housed in 20 or 40-foot shipping containers. These can include cruise missiles, anti-ship missiles, Redut/Pantsir-M-type AD system, and submarine defenses.
https://iz.ru/1038280/roman-kretcul-aleksei-ramm/konteiner-s-pritcelom-boevye-moduli-vmf-protestiruiut-do-kontca-leta

Of course, Russia has previously developed the Club-K, the export variant of the Kalibr missile, that can be employed from shipping containers. Now Russia is looking to add other systems, including anti-submarine torpedo and hydroacoustic systems. 2/

They have also developed a medical container with an operating room and an intensive care unit that can be used to improve a ship's medical capabilities for humanitarian assistance and disaster relief (HADR) operations. 3/

Other containers are designed to house UAVs, UUVs, and a module for hydrographic work. The Project 22160 Vasily Bykov patrol ships, Project 20386 Derzky (Merkuriy) corvettes, and Project 23550 Ivan Papanin icebreaking patrol ship are designed to use these containers. 4/

Izvestia reports that they will be tested by the Northern Fleet this year. They can be integrated into the ships' control system and connect to a ship's power supply, or they can operate autonomously. 5/

Obviously, these containers will allow the Russian Navy to quickly improve a ship's capabilities for specific missions, and they are in line with the Russian Navy's emphasis on modularity. 6/