In early 1943, the Home Army built up its forces in preparation for a national uprising. The situation was soon complicated by the continuing strength of Germany and the threat presented by the advance of the Soviets, who promoted a territorial and political vision of a future Poland that was at odds with what the Polish leaders were striving for. The Council of National Unity, a quasi-parliament, was instituted in occupied Poland on 9 January 1944; it was chaired by Kazimierz Pużak, a socialist. The plan for the establishment of Polish state authority ahead of the arrival of the Soviets was code-named Operation Tempest and began in late 1943. Its major implemented elements were the campaign of the 27th Home Army Infantry Division in Volhynia (from February 1944), Operation Ostra Brama in Vilnius and the Warsaw Uprising. In most Polish-Soviet encounters, the Soviets and their allies ultimately opted not to cooperate with the Home Army and ruthlessly imposed their rule; in the case of the Warsaw Uprising, the Soviets waited for the Germans to defeat the insurgents. The forces of the Polish right-wing called for stopping the war against Germany and concentrating on fighting the communists and the Soviet threat.