Okay, basically, the Soviet army DOESN'T rape and pillage the countries they enter. How? That's why this is a challenge.
Goal is to have no noticeably large amounts of rape from the Soviet military. Looting is fine, however not on such a scale that it causes the countries they enter to hate them.
This will probably require a rather far back POD, so I'll be interested to see what's came up with.
So pillage is not permited, but looting is a-ok?
Hmm... So the Soviets don't rape, pillage and murder. I can think of a few PODs that will ensure that this won't happen.
1.- Meteor impact Earth before 1917, killing everyone.
2.- Yellowstone erupts. The northen hemisphere becomes uninhabitable.
3.- Gavilo Princip chokes on his damn sandwich.
4.- The Whites win the Russian Civil War.
5.- Nazi victory in the Eastern Front. The Soviet Union collapses.
Without a Soviet Union, you don't have Soviet attrocities occuring.