Countries behind Iron Curtain are shaded red. Yugoslavia, although communist-run, was independent of the Eastern Bloc. Similarly, communist Albania broke with the Soviet Union in the early 1960s, aligning itself with the People's Republic of China after the Sino-Soviet split.

The Iron Curtain is a term related to the Cold War. It means the border between the states that were members of the Warsaw Pact (in Eastern Europe), and those that were not (then called The West).

This border was between East Germany and West Germany, between Czechoslovakia and Austria, and between Hungary and Austria.