"Komintern", in company with the cruisers "Krasny Kavkaz", and a number of destroyers, laid down a defensive mine barrage protecting the Black Sea Fleet base at Sevastopol on 22 June. "Komintern", along with the destroyers "Nezamozhinsk" and "Shaumyan", was assigned to cooperate with the Separate Coastal Army on 8 August 1941 and spent much of the next month bombarding Romanian positions and coast defenses. During the siege of Odessa she escorted a number of convoys to and from the besieged city. During the Crimean Campaign "Komintern" delivered supplies to the 44th Army at Feodosiya on 1 January 1942 and ferried troops and supplies to Sevastopol for the next several months.