In the Potsdam Agreement of 1945, the Allies of World War II had defined the Oder-Neisse line as the line of demarcation between the Soviet occupation zone in Germany and Poland, pending the final determination of Poland's western frontier in a later peace settlement.
With German reunification finally within reach in 1990, the Allies of World War II made full sovereignty for Germany conditional on the final recognition of the Oder-Neisse border, as stipulated in article 1.2 of the Treaty on the Final Settlement with Respect to Germany [REF].