However , both Soviet Russia and Finland had flotillas in Ladoga ( see also Finnish Ladoga Naval Detachment ) .
According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted .
Both Soviet Russia and Finland had flotillas in Ladoga ( see also Finnish Ladoga Naval Detachment ) .
According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted .