Challenge: Warsaw Pact as big as For All Time's CPSD

For All Time.

I know that the scenario was meant to be an implausible dystopia from the get-go, but it still paints a horrifically vivid world.

So, how could the Warsaw Pact/Soviet Union be large enough to incorporate a larger East Germany, Austria, Italy, and all of the Balkans including Greece? And what about Turkey and/or Persia?
 
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