When Russian and Soviet naval power peaked

When did Russian and Soviet naval power reach their respective peaks?

Imperial Russia peaked around 1815-1820, while Soviet naval power peaked around 1988-1989.

The answer separates two institutions rather than treating Russian and Soviet sea power as one continuous peak. Imperial Russian naval effectiveness grew under Catherine the Great and reached its strongest position around 1815-1820. Soviet naval power instead peaked around 1988-1989, immediately before the system's collapse. The comparison reminds viewers that fleet size, institutional competence, and the strategic position of the state must be judged within their own eras.