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Problems of Peace and Socialism (Russian: Проблемы мира и социализма), often referred to by the name of its English-language edition World Marxist Review (WMR), was a joint theoretical and ideological magazine of communist and workers parties around the world. It existed for 32 years, until it closed down in June 1990. The offices of WMR were based in Prague, Czechoslovakia. Each edition of the magazine had a circulation of above half a million, being read in some 145 countries. At its height, WMR appeared in 41 languages, and editors from 69 communist parties around worked at its office in Prague. The master copy of the magazine was its Russian-language edition Problemy Mira i Sotsializma.