What evidence can you find that the soviets needed encouragement to join the war against japan?

The Allied Army was pleading with the Soviet Union to help them in the war against Japan, but Stalin wasn't convinced. Finally, at the Tehran conference in 1943, the Soviet Union decided they would not enter the war against Japan until the Allied Army defeated Nazi Germany

mark brainlies

the answer would be a)henry grady because he came up with the term "new south"