But only until it was strong enough to "expand".===
I don't defend Stalin but truth. Stalin and his croies wanted to power Soviet Union alone. For this many facts speak.
Vlad Ryzun the author of "Icebreaker" isn't historian but manipulator. He misinterpreted facts. He ingnored facts which doesn't support his version.
The better read then his book are the diaries of german general Gulder who was the head of Staff of Vermaht before and at beginning WW2.
Gulder never told such thing like "preventive war". He showed all process of preparation of the operation Barbarossa -the plan of attack on Soviet Union. It was implemented 2 years before accual attack on Soviet Union. No prevention just scheduled attack.