The “two plus four” treaty was quickly ratified by unified Germany and the three Western powers. Moscow, on the other hand, has taken its time. After a long and controversial debate in the Supreme Soviet, it ratified the treaty on 4 March 1991. The treaty came into force on 15 March 1991, when the instruments for ratification were handed over to German Foreign Minister Hans-Dietrich Genscher. On 2 August 1945, the Potsdam Agreement, proclaimed at the end of the Potsdam Conference, agreed, among other things, on the initial conditions under which the World War II Allies were to rule Germany. A temporary German-Polish border, known as the Oder-Neisse line, has in theory attributed most of the German provinces in eastern Germany to Poland and the Soviet Union as part of this “temporary border”. The German population in these areas has been displaced or killed. These agreements were provisional and the agreement provided that the situation would be concluded by “a peace settlement for Germany accepted by the German government if an appropriate government is formed” (Potsdam Agreement 1.3.1). Parts of these agreements mentioned above have been riddled with controversy from several sources, z.B.
Churchill`s comment on “the Polish goose too full” (by German countries). The “German question” has become one of the most important and crucial issues of the long-running Cold War, and until the late 1980s there had been little progress in forming a single German government, appropriate to the agreement on a final settlement. This meant that Germany, in some respects (to a large extent, but not only technically), was not taking over full national sovereignty. 42-43 Finally, at a meeting in the Caucasus in July 1990, Soviet Chancellor Mikhail Gorbachev approved German reunification. Previously, the United States and the European Economic Community, the forerunner of the European Union, had already welcomed reunification. The Treaty on the Final Settlement with respect for Germany (in German: the Treaty on the Final Settlement on Germany [a] or the Two Plus Four Agreement (In German: Two Plus Four; b) in German Short) was negotiated in 1990 between the Federal Republic of Germany and the German Democratic Republic (both names) and the four powers that occupied Germany in Europe at the end of the Second World War. The United Kingdom and the United States. In the treaty, the Four Powers renounced all the rights they held in Germany, so that a reunified Germany could become entirely sovereign the following year.    At the same time, the two German states (later confirmed by a unified Germany) agreed to confirm their agreement on the existing border with Poland and agreed that after reunification, Germany`s borders would correspond only to the areas then managed by West and East Germany, with all other territorial claims (z.B on Kaliningrad Oblast) being excluded and abandoned.