Bcs I have neither read, nor heard of a serious study which suggested otherwise. Doesn't mean that may not exist ofc.
Your link to the contrary, please?
There are few studies, to say the most important search for books of :
Viktor Suvorow and his Icebreaker :
https://en.wikipedia.org/wiki/Viktor_Suvorov
Mark Solonin and his work about first days of Operation Barbarossa and how USSR was preparing for a gigantic assault in 1941/1942:
https://en.wikipedia.org/wiki/Mark_Solonin
For telling if these are serious studies, I recommend reading few books from these two guys.
Theres also article about this controversy (that USSR was planning major assault on whole Europe (even some parts of Asia) and raised/supported German Nazis to weaken Europe before that attack) here:
https://en.wikipedia.org/wiki/Soviet_offensive_plans_controversy
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