What a small Ukrainian submarine force might have changed

Could a few diesel-electric submarines have helped Ukraine during Russia's 2022 invasion?

They could have complicated Russian operations and perhaps achieved a prominent sinking, but their ability to survive and remain operational is unknowable.

Even a small undersea threat would impose a continuing anti-submarine burden. Russia would have to devote ships, aircraft, sensors, and attention whenever Ukrainian boats might be at sea. That diversion could complicate other Black Sea operations even if the submarines fired rarely. Their survival, readiness, and actual successes cannot be inferred from the counterfactual alone.