This work mainly focuses on the feature of Christian unity in the works of Aleksandar Men, a Russian presbyter who sees the Church as unique in its mystery in Christ, with Christ and after Christ and the Trinity which contributes to the unity of one and whole Catholic Church. According to him this mutual confession is possible only if, firstly, this whole Church and its mystery are really present in every local (episcopal) Church which celebrates the Eucharist and secondly, if this unity and equality is expressed by mentioning other patriarchs (bishops) in the Eucharistic celebration, despite the cultural diversity and multiplicity. This work is divided into six parts. The first unit serves as a form of introduction bringing the historical and social context in the time when theologist Aleksandar Men lived, followed by his spiritual profile and opinions of the witnesses of his faith. The second unit shows the original material and all ecumenic potential of Aleksandar Men’s thoughts and actions and synthesizes it in a unique ecumenic vision of father Men. Comparing this vision with former ecumenists of the Russian Orthodox church confirmed its originality. Comparison with the present situation in Church makes up the following three chapters. It firstly introduces the ecumenical attitude in the Orthodox Church with variations in the relationships of different currents and then analyses the relationship of the Othodox Church towards father Men’s figure, work and ecumenic vision. The fourth unit explores pervasion of father Men’s ecumenic vision with ecumenic thoughts in the Roman Catholic Church showing that Men’s ecumenic model is largely common (in the important thoughts) to the attitudes and work of the newer popes – Paul IV, John Paul II, Benedict XVI and Francis. The fifth unit describes ecumenic dialogue with Protestant Churches and other Christian communities and the diversity in their ecumenic attitudes that father Men’s ecumenic vision could bridge. The final, sixth unit, presents a model of unification that can be based on Men’s ecumenic vision which lies on dialogue, respecting each person’s individuality and viewing every culture as richness of Christianity. This last unit concludes that the ecumenic vision of father Men is suitable as a unique model for the unification of the Christian churches and communities.