Did the U.S. want to surprise Japan or the Soviet Union?

Russia and the United States were allies during World War II, but that certainly did not mean that they were friends. The alliance with Russia was to fight Nazism, which at the time seemed to be the greater of the two evils. Throughout the war the United States involved Russia as little as possible in important decisions, which made the Soviet Union upset seeing as they had the most devastating loss of life of any …

…Nagasaki the most powerful weapon in the world. It is these points that suggest that the atomic bomb, though targeting military and industrial cities in Japan, was also targeted towards Communist Russia. This is part of a three-part assignment. The other pieces are Did the military situation justify a surprise attack with the atom bomb? and Why did the U.S. drop the second bomb so close to the first? Thank you for your time.