Stalin's paradoxical contribution to Soviet naval history

What was Stalin's best contribution to naval history?

Keeping the Soviet Navy in existence despite opposition to maintaining one.

The answer answers the question with an institutional rather than operational achievement. It says Stalin's most important naval contribution was ensuring that the Soviet Union continued to possess a navy. Other figures opposed maintaining that force, so political backing mattered to its survival. The answer is not praise for a particular campaign or design, but recognition that later Soviet naval history required the institution to persist in the first place.