 Complete the following phrase:  In January 1944, Soviet troops had reached the former PolishSoviet 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 