[racional]

Stopping Axis aggression against the USSR

And with it, the enactment of the Final Solution in its territories.

Are you sure you mean to say that you're "not sure" if stopping this project in its tracks was a good idea or not?

We know that this wasn't the primary motivation behind the decision of the Soviet-Western alliance, of course. But it was indisputably one of the key outcomes of the war and that cooperation.