Die Oosblok was die groep sosialistiese state van Sentraal- en Oos-Europa, gewoonlik die Sowjetunie en die lande van die Warskouverdrag. Die Sowjetunie se bondgenote in die Oosblok is dikwels "satellietstate" van die Sowjetunie genoem. Hirsch, Donald; Kett, Joseph F.; Trefil, James S. (2002), The New Dictionary of Cultural Literacy, Houghton Mifflin Harcourt, p. 316, ISBN 0-618-22647-8, "Eastern Bloc. The name applied to the former communist states of eastern Europe, including Yugoslavia and Albania, as well as the countries of the Warsaw Pact"  Satyendra, Kush (2003), Encyclopaedic dictionary of political science, Sarup & Sons, p. 65, ISBN 81-7890-071-8, ""the countries of Eastern Europe under communism""  Compare: Janzen, Jörg; Taraschewski, Thomas (2009). Shahshahānī, Suhaylā (red.). Cities of Pilgrimage. Iuaes-series. 4. Münster: LIT Verlag. p. 190. ISBN 9783825816186. Besoek op 2012-12-21. Until 1990, despite being a formally independent state, Mongolia had de facto been an integral part of the Soviet dominated Eastern Bloc.