[1] With the uprising against the Swedish king in 1317, the Novgorodians decided to take advantage of the chaotic situation in Sweden.

[1] In the summer of 1318, the Novgorodians invaded along the coast and on 11 July the defenders of Åbo were overwhelmed, the nearby bishopric Kustö was captured and burned down, in the fire, the bishops archives which included all of Finlands earlier history were destroyed.

[4] After the attack, the Novgorodians offensive capability was quickly exhausted, which forced them to adopt a restrictive campaign against the Swedes.

[1] Since the two powers were incapable of annihilating the other, the two, with instigation from the Hanseatic League, signed the Treaty of Nöteborg in 1323.

This agreement for the first time formally established the border between the two, cutting the Karelian Isthmus in two, following the course of the Vuoksi, crossing the Savo towards the northwest, and reaching the north of the Gulf of Bothnia.