Question

what does Japan surrender?

Answer 1

The surrender of imperial Japan was announced on August 15 and formally signed on September 2, 1945, bringing the hostilities of world war ll to a close . by the end of July 1945 , the Imperial Japanese Navy (IJN) was incapable of conducting major operations and an Alied invention of Japan was imminent.

Hope it helps you.

Answer 2

Because a surrender to the United States and the subsequent US occupation was infinitely more preferable to an invasion and occupation by the Soviet Union, which appeared to be imminent as the Soviet Red Army overran the Kwangtung Army in northern China. 

It's all summed up in Hirohito's awkward surrender speech (broadcast on Aug. 15, 1945): "The war situation has developed not necessarily to Japan's advantage."

True words. For a full sense of Japan's catastrophic problems at war's end