There are thousands of small bunkers in Albania. What were Albanians afraid of?

Soviet invasion
NATO invasion
Global nuclear war
Italian invasion
Albania was a communist country and one of the Warsaw Pact founding countries. However, their relations with Soviet Union deteriorated after Albania defended the "purity" of Marxism by attacking both "US imperialism" as well as "Soviet and Yugoslav revisionism". After the Soviet invasion of Czechoslovakia in 1968, Albania felt they may be next.
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Illustration: SarahTz