Before the war, the Soviet Union demanded that the frontier between the USSR and Finland on the Karelian Isthmus be moved westward to a point 30 kilometers east of Vyborg to the line between Koivisto and Lipola, that existing fortifications on the Karelian Isthmus be demolished, and the islands of Suursaari, Tytärsaari, and Koivisto in the Gulf of Finland and Rybachy Peninsula be ceded.