Originality of diplomacy of the Constantinople church in its relations with the Russian Orthodox Church in the 20th century

The article is a review on the book that deals with issues of the Church diplomacy in the 20th century: Mazyrin A., priest, Kostryukov A. A. Iz istorii vzaimootnosheniy Russkoy i Konstantinopol’skoy Tserkvey v XX veke [From the history of relations between the Russian and Constantinople Churches in the 20th century]. Moscow: PSTGU Publ., 2017. 376 p. (Materialy po noveyshey istorii Russkoy Pravoslavnoy Tserkvi [Materials on the newest history of the Russian Orthodox Church]. Ed. by archpriest V. Vorob’yev et al.).