<Li> The provisional western border should be the Oder--Neisse line, defined by the Oder and Neisse rivers . Silesia, Pomerania, the southern part of East Prussia and the former Free City of Danzig should be under Polish administration . However the final delimitation of the western frontier of Poland should await the peace settlement (which would take place 45 years later at the Treaty on the Final Settlement with Respect to Germany in 1990) </Li> <Li> The Soviet Union declared it would settle the reparation claims of Poland from its own share of the overall reparation payments . </Li> <P> In addition to the Potsdam Agreement, on 26 July, Churchill, Truman, and Chiang Kai - shek, Chairman of the Nationalist Government of China (the Soviet Union was not at war with Japan) issued the Potsdam Declaration which outlined the terms of surrender for Japan during World War II in Asia . </P> <P> Truman had mentioned an unspecified "powerful new weapon" to Stalin during the conference . Towards the end of the conference, Japan was given an ultimatum to surrender (in the name of the United States, Great Britain and China) or meet "prompt and utter destruction", which did not mention the new bomb but, at the same time promised' it was not intended to enslave Japan' . The Soviet Union was not involved in this declaration as it was still neutral in the war against Japan . Prime minister Kantarō Suzuki did not respond (mokusatsu, which was interpreted as a declaration that the Empire of Japan should ignore the ultimatum). Therefore, the United States dropped atomic bombs on Hiroshima on August 6 and Nagasaki on August 9, 1945 . The justification was that both cities were legitimate military targets, to end the war swiftly, and preserve American lives . However, to some the timing has suggested that Truman did not want Stalin involved in the terms of Japan's surrender . It is important to note that Truman delayed the Potsdam Conference in order to be sure of the functionality of this "powerful new weapon". Notably, when Truman informed Stalin of the atomic bomb, he did not explicitly mention its atomic nature, just vaguely saying that the United States "had a new weapon of unusual destructive force"; Stalin, though, had full knowledge of the atomic bomb's development due to Soviet spy networks inside the Manhattan Project, and told Truman at the conference to "make good use of this new addition to the Allied arsenal". </P>

Why did diplomatic relations amongst the allies deteriorate in potsdam in july 1945