In January 1944, Soviet troops had reached the former Polish–Soviet border, and by the end of July 1944, they again re-annexed the whole territory that had been taken by the USSR in September 1939 into their control. During the Tehran Conference in 1943, a new Soviet-Polish border was established, in effect sanctioning most of the Soviet territorial acquisitions of September 1939 (except for some areas around Białystok and Przemyśl), ignoring protests from the Polish government-in-exile in London. The Potsdam Conference, via substantive recognition of the pro-Soviet Polish Committee of National Liberation, implicitly consented to the deportation of Polish people from "Kresy" (see Polish population transfers (1944–1946)). Most Polish inhabitants of "Kresy" were ordered by the Soviets to migrate west to Germany's former eastern provinces, newly emptied of their German population and renamed as the "Recovered Territories" of the People's Republic of Poland, based on Polish medieval settlement of the areas. Poles from the southern "Kresy" (now Ukraine) were forced to settle mainly in Silesia, while those from the north (Belarus and Lithuania) moved to Pomerania and Masuria. Polish residents of Lwów settled not only in Wrocław, but also in Gliwice and in Bytom. Those cities had not been destroyed during the war. They were relatively closer to the new eastern border of Poland, which could become significant in case of a sudden hoped for a return to the East.