We were talking about 1939,
The USSR had exactly the same right to invade Poland as the US to invade Korea, Vietnam, Iraq, and Afghanistan.
If you add up the casualties caused by the Soviets and the US, it's not even close. In this contest, the US wins, but not in a good way.
The difference: the Soviets invaded a country next door as a defensive move.
The US invaded countries 5,000 to 10,000 miles away for THEIR "freedom and democracy". This was sicker than LGBT AIDS.