The British and French, who favored the Polish government in exile in London, persuaded the USSR to agree to a tripartite commission that would aid in the organization of a Polish government.
At the Yalta Conference, Poland's eastern territories were reduced approximately to the “Curzon line” of 1919, while its western border, pending a final peace settlement, was extended to the Oder-Neisse line in eastern Germany. The leadership of postwar Poland was claimed by two rival groups, the Soviet-sponsored provisional government at Lublin, and the Polish government in exile in London.
After lengthy negotiations, a government of national unity was formed, under Socialist premier Eduard Osobka-Morawski of the Lublin administration. It was recognized by the Western powers, though its leanings turned out to be decidedly pro-Soviet. For this reason, many Polish citizens who, as displaced persons or members of Poland's armed forces, were still in Western Europe refused to be repatriated.
