This must be either bug or mistake in the AI execution files!
Why? Because when you look at the date (3/19/1942) and the state of sea in the Gulf of Finland (frozen solid!) there is no way the Russians could move their ships through the sea.
Besides, The Gulf of Finland was the most heavily mined sea-area in the WWII, Russians could not, literally, get their ships over to Kurressaare. They could not even supply Hanko which they took over after Winter war.
Nobody respects a country with a poor army, but everybody respects a country with a good army. I raise my toast to the Finnish Army.
Attributed to Josef Stalin, 1948.