I'm at about the half of Suvorov's book, but in the meantime I looked into David Glantz's Barbarossa Derailed too. I wrote here >>/21732/ what I read in the Icebreaker that Germans were idiots and didn't know obvious things... I found in Glantz's work the other side of the coin.
Read and be amazed (Chapter 1 page 21):
Soviet War Planning: Defense Plan-41 (DP-41) and the “Answering” Strike
Ironically, the infamous Ribbentrop-Molotov Non-Aggression Pact, which Stalin negotiated with Hitler in August 1939, actually contributed to the catastrophic defeat the Red Army suffered during the initial stages of Operation Barbarossa. By signing the infamous pact, Stalin hoped to forestall possible German aggression against the Soviet Union and, while doing so, create a “buffer” or security zone by seizing eastern Poland and the Baltic States. However, the subsequent Soviet invasion and occupation of eastern Poland in September 1939 and the Baltic States in the fall of 1940 brought the Soviet Union into direct contact with German-occupied territory.
So what basically Glantz says, that they wanted to create a buffer zone (what was already existed in the form of the countries between Germany and the SU), but the Soviet leaders didn't know the SU will border Germany with the occupation of Poland.