Unfortunately the USSR had to stop at Berlin. They sacrificed 20-25 million people to fighting fascism. Lost 2/3 of their industrial capacity. The war very nearly destroyed them. America meanwhile paid german industrialists reparations. and built up West Germany through the Marshall Plan and the creation of NATO (which predates the Warsaw pact). The USSR was in no position to "go past Berlin" when America had nuclear weapons and the USSR would not for a few more years. The bomb was used on Nagasaki and Hiroshima not because it was needed to defeat Japan, but because it was a message for Stalin. Moscow would be rubble if he tried anything.
Unfortunately the USSR had to stop at Berlin. They sacrificed 20-25 million people to fighting fascism. Lost 2/3 of their industrial capacity. The war very nearly destroyed them. America meanwhile paid german industrialists reparations. and built up West Germany through the Marshall Plan and the creation of NATO (which predates the Warsaw pact). The USSR was in no position to "go past Berlin" when America had nuclear weapons and the USSR would not for a few more years. The bomb was used on Nagasaki and Hiroshima not because it was needed to defeat Japan, but because it was a message for Stalin. Moscow would be rubble if he tried anything.