The Union of Eastern European Republics and the Eastern European Treaty Organization is formed by the Eastern European states Lithuania, Poland, Hungary, Romania, Slovakia and Yugoslavia-Albania. Greece gets observer status at the UEER. Both treaty are signed in 1964.6 București Treaty.

The member nations.
Nation. Year of joining. Year of leaving.
Lithuania 1964.6 -
Poland " -
Hungary " -
Romania " -
Slovakia " -
Yugoslavia-Albania " -

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