I am reading a book(The Chief Culprit) according to which Stalin planned to use Hitler as an icebreaker against the west, provided Hitler with significant material and political support while at the same time planning to prepare the Red Army to attack Nazi Germany and the rest of Europe..
Suvorov is controversial, to say the least, and has come up here before. I addressed it briefly in this thread awhile back, which might be of interest to you.