The Soviet declaration of war had the same effect as a coup de grace shot. The shot simply hastened the death. A death that was coming anyway. The importance of the Soviet's declaration of war, was to be legally able to get in on the spoils of war; territorial gain. Which they accomplished. It would also lead to the Korean War, 5 years later. Both the US and the USSR had been gearing up for the cold since 1945. Actually since before that...D-Day! By June '44, the Soviets (Russians) and the Americans were already trying to see who would reach Berlin first. Which is the real reason D-Day was so important. If the Russians (Soviets) took Berlin without US/British involvement, then they might have all of Germany (to themselves).
foreign policy
Some say that Truman wanted to send a message to the Soviet Union ~apex
The Yalta conference was a meeting of soviet and American officials in early 1945. They agreed that the USSR would help America in the Pacific front after Germanys surrender and they agreed that when reconstucting countries they would support free elections.
The "détente" with the Soviet Union. The Soviet Union's invasion of Afghanistan led to a virtual collapse of Soviet-American relations.
The Soviet Union or Soviet Empire. They are the same.
did not result in Japanese surrender
The atomic bombing of Hiroshima and Nagasaki and the declaration of war on Japan by the Soviet Union
The Japanese government had been talking to the Soviet government in an attempt to broker a negotiated peace with the Allied nations. The Soviets were not at war with Japan in the spring of 1945, since they had their hands full with Germany. After the German surrender in May 1945, the Soviet Union had promised the West they would declare War on Japan at the beginning of August 1945. The US Secretary of War Stimson and the atom bomb builder General Groves felt three great shocks would bring the Japanese to the surrender table. One shock was the declaration of war by the Soviets and the plunge into Manchuria, while the second and third shocks were the two atom bomb strikes. This left the Japanese Government at a tie vote in the Cabinet. At this point the peace faction asked the Japanese Emperor for his opinion. He said Japan must surrender.
The decisive conclusion of the Pacific War through Japanese unconditional surrender came at due to three factors. The first were Truman's decision to conduct nuclear strikes against Hiroshima and Nagasaki. The second were that Japan risked invasion of its homeland from both the Soviet Union and the United States (the planed but never executed Operation Downfall). The choices between being overrun by the Soviet Union, and ending further nuclear strikes, proved instrumental in the Japanese decision to surrender to the United States.
The allies: mainly the united states of america, the british empire and the soviet unoin
On July 26, Truman and other allied leaders issued the Potsdam Declaration outlining terms of surrender for Japan. It was presented as an ultimatum and stated that without a surrender, the Allies would attack Japan, resulting in "the inevitable and complete destruction of the Japanese armed forces and just as inevitably the utter devastation of the Japanese homeland". The atomic bomb was not mentioned in the communique. On July 28, Japanese papers reported that the declaration had been rejected by the Japanese government. That afternoon, Prime Minister Kantaro Suzukideclared at a press conference that the Potsdam Declaration was no more than a rehash (yakinaoshi) of the Cairo Declaration and that the government intended to ignore it (mokusatsulit. "kill by silence The statement was taken by both Japanese and foreign papers as a clear rejection of the declaration. Emperor Hirohito, who was waiting for a Soviet reply to noncommittal Japanese peace feelers, made no move to change the government position. On July 31, he made clear to his advisor Kōichi Kido that the Imperial Regalia of Japan had to be defended at all costs.In early July, on his way to Potsdam, Truman had re-examined the decision to use the bomb. In the end, Truman made the decision to drop the atomic bombs on Japan. His stated intention in ordering the bombings was to bring about a quick resolution of the war by inflicting destruction and instilling fear of further destruction in sufficient strength to cause Japan to surrender.
North of the 38th, the Soviet Union accepted the surrender of Japanese forces, leading to the creation of a Communist North Korea.
The United States and the Soviet Union
Soviet Union
As Japan faced defeat after defeat in Pacific campaign, its navy became increasingly ineffective to put up a fight. By July end, 1945 Japan could not defend itself against an imminent Allied attack against mainland Japan. While Japan was looking for assistance from Soviet Union to arrange a surrender with more favorable terms for Japan, USA dropped atomic bomb on Hiroshima and Nagasaki. Soviet Union also in a very bizarre manner declared war on an already beleaguered Japan. These events forces Emperor Hirohito asked Japanese government to agree to allied terms of surrender set in Postdam declaration. Japanese surrender was announced on September 2, 1945.
Things were desperate for the German army in the first week of December 1941. They had almost taken Moscow. However, Soviet counter attacks had destroyed any hope of taking the city and had put the whole of the German front in jeopardy. With Japan's attack on Pearl Harbour, Hitler hoped that his declaration of war on the USA, would encourage the Japanese to attack the soviets. His hope was that Soviet soldiers,including the Siberians, would be drawn away from the Eastern front to defend against a Japanese attack at the other end of the Soviet Union, hence taking pressure off the German Army. As soon as Htler made this decision he had lost the war. This was one of Hitler's worst decisions. Right up there with Dunkirk, delay in Yugoslavia, transfer of forces to Kiev, Stalingrad and Kursk. The Japanese had no intention of attacking the Soviet Union. Through secret intellegenge the allies new this. Hitler did not!
The UN decision to intervene in Korea was not vetoed by the Soviet Union because at that time the Soviet Union was not a part of the UN. The Soviet Union had removed itself from the UN in protest.