Could Soviet industry sustain its 1930s fleet program?

Was the Soviet Union's 1930s naval development program overly optimistic?

Yes; its ambitions outran industrial preparation, unlike Britain and later the United States, which invested in shipyard capacity before demanding full wartime output.

The Soviet program was overly optimistic, although ambitious rearmament plans were common. The decisive distinction was prior investment in yards, tools, and production capacity: Britain began rebuilding that base in the mid-1930s, and the United States had time to expand before its largest wartime orders. France, Germany, and the Soviet Union did not complete a comparable preparation cycle before war disrupted their plans.