This was a primary mission when Roosevelt was in office as he realized the importance of the Soviets weakening the Axis Powers. He tried to convince them to join in war at the Yalta Conference with no success but with the knowledge that the Soviets wanted to invade Japanese controlled Manchuria. When Truman came in office they pushed this information aside instead of realizing the vulnerability in Japan this could produce. Because of the information they knew, all they had to do was wait for the Soviets to take action before the US did anything. The US ended up acting first with the bombing of Hiroshima and the Soviets used the better strategy of waiting for us. The Soviets attacked Manchuria and took it from Japanese hands. The Japanese surrendered not too long after the loss of Manchuria, causing many to believe that losing this land made the Emperor lose his Bushido code. The Soviet invasion could have very well been the tip of the iceberg that caused Japanese surrender, and the US did not need to use the atomic bombs as quickly as