Two million Soviet and Eastern Europeans found themselves on our side of the line when WWII ended. We shipped them back to imprisonment and death under Stalin. Many committed suicide rather than return. We could have used them to invade the Soviet Union.
We had a monopoly on the A-Bomb for 4 years.
The reason we did not push on to Moscow was not because it was impractical. It was because of traitors in both the US and British governments.
An act of cold-blooded obscenity I have never understood.