After World War II, the border was drawn from Świnoujście (Swinemünde) in the north at the Baltic Sea southward to the Czech Republic (then part of Czechoslovakia) border with Poland and Germany near Zittau. It follows the Oder–Neisse line of the Oder (Odra) and Neisse (Nysa) rivers through most of their course. This was agreed upon by the main Allies of World War II – the Soviet Union, the United States, and the United Kingdom, at the Soviets' insistence, and, without any significant consultations with Poland (or Germany), at the Yalta Conference and Potsdam Conference. Soviet foreign minister Vyacheslav Molotov, replied to Mikołajczyk's question about the western border of Poland that "it should be based on the Oder River". At the summit in Yalta, the leaders of the powers decided to hand over to Poland part of East Prussia with Olsztyn and Elbląg, Pomerania with Gdańsk and Szczecin, Lower and Upper Silesia with Opole, Wrocław and Gliwice, and the Lubusz land. On July 24, the only time in history, the communist Bierut and the oppositionist Stanisław Mikołajczyk spoke with one voice, fighting for the Oder and Eastern Neisse line. Churchill insisted on Eastern Neisse, which meant that Wałbrzych with its region and Jelenia Góra would remain German. Just before the final protocol was signed, Soviet diplomats made one more amendment according to which the border was to run "west of Świnoujście". Like a trifle, but thanks to this Szczecin got free access to the Baltic Sea.