During Occupation of Estonia by Nazi Germany (1941–1944) Alexey Ridiger attended with his father Mikhail, who had become an Orthodox priest on 20 December 1942, the German prison camps in Estonia offering salvation to the Russian prisoners of war. Such activities were tolerated by the German occupation authorities because it was seen as an effective anti Soviet propaganda. After Soviet forces returned to Estonia in the autumn of 1944, unlike the most of the people with Baltic German roots, the Ridiger family chose to stay in Estonia and didn't evacuate to the west.