Question: What is the other name  for a huge area of heavy fighting across Europe with the Soviet Union having occupied and annexed several countries effectively handed over by Nazi Germany?
Sentence (from "Military occupations by the Soviet Union"): Apart from Molotov–Ribbentrop Pact and post-war division of Germany, USSR also occupied and annexed Carpathian Ruthenia from Czechoslovakia in 1945 (became part of Ukrainian SSR).
Relevant evidence: No