In April 1944 he was assigned as operations officer of the Northern Fleet but insisted on joining a fighting unit. Alexeyev was given command of the 3rd Torpedo Boats Squadron. During the Petsamo-Kirkenes Operation, on October 21. His unit sank 17 enemy supply ships without suffering casualties. For this achievement Alexeyev was awarded the title Hero of the Soviet Union and the Order of Lenin on 5 November 1944. He participated in the Victory Parade.