Lake Ladoga Stolbovo, the northern and western coast was ceded by Russia to Sweden. In 1721, after the Great Northern War, it was restitution to Russia by the Treaty of Nystad. Later, in 1812–1940 the lake was shared between Finland and Russia. According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted. However, both Soviet Russia and Finland had flotillas in Ladoga (see also Finnish Ladoga Naval Detachment). After the Winter War (1939–40) according to the Moscow Peace Treaty, Ladoga, previously shared with Finland, became an internal basin of the Soviet Union. During the Continuation
Staraya Ladoga the town's military significance also decreased. Ladoga belonged to the Vodskaya pyatina of the Republic and contained eighty-four homesteads in the 15th century; most of the land belonged to the church. The Novgorodians built there a citadel with five towers and several churches. The reconstruction of one of the towers of Staraya Ladoga's fortress was scheduled to be completed in 2010. The heart of Staraya Ladoga is an old fortress where the Yelena River flows into the Volkhov. In earlier times, it was a strategic site because it was the only possible harbor for sea-vessels that could not navigate through