What if the Russian lost World War 2?

Answer 1

Then the US would have had to use the A bomb on Germany

Answer 2

If the Russians had lost World War 2, it would have likely resulted in a significant shift in the balance of power and the outcome of the war. Nazi Germany would have likely expanded its control over Europe and potentially other regions, greatly altering the course of history. The consequences for the Soviet Union and the world would have been severe, as the aftermath of a German victory would have likely included extensive territorial changes and ideological shifts.