During the war Joseph Stalin had revived the Russian Orthodox Church in the Soviet Union. Having been closed during the war time, after the Soviet annexation of Estonia the Alexander Nevsky Cathedral, Tallinn was reopened in 1945. Alexey Ridiger who had become a Soviet citizen served as an altar boy in the cathedral from May to October 1946. He was made a psalm-reader in St. Simeon's Church later that year; in 1947, he officiated in the same office in the Church of the Kazan Icon of the Mother of God in Tallinn.