If you’re sitting between the Soviets and the Nazis and saying “Well, I can’t say which is the lesser evil”, you’re no one I would sit at a table with.
If you’re sitting at a table with the Soviets saying “Well, I can say they’re better than the Nazis”, you’re no one I would sit at a table with.
At some point the evil is so bad that lesser evilism doesn’t work, you have to fight on both fronts, sooner or later, anyway. Ask Makhno. Best you can do is play them against each other.
Not to mention that the Soviets and Nazis were fucking allies.