Elizabeth abolished the cabinet council system that had been used under Anna, and reconstituted the Senate as it had been under Peter the Great, with the chiefs of the departments of state (none of them German) attending. Her first task after this was to address the war with Sweden. On 23 January 1743, direct negotiations between the two powers were opened at Åbo (Turku). In the Treaty of Åbo, on 7 August 1743 (O.S.), Sweden ceded to Russia all of southern Finland east of the Kymmene River, which became the boundary between the two states. The treaty also gave Russia the fortresses of Villmanstrand and Fredrikshamn.