2018 Moscow–Constantinople schism in the context of "Eastern Orthodox Churches"

The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is one of the three major doctrinal and jurisdictional groups of Christianity. As of 2012, it has approximately 300 million adherents and is the third largest religious community in the world after Catholics and Sunni Muslims. The Eastern Orthodox Church operates as a communion of autocephalous churches, each governed by its bishops via local synods. The church has no central doctrinal or governmental authority analogous to the pope of the Catholic Church. Nevertheless, the Ecumenical Patriarch of Constantinople is recognised by them as primus inter pares ('first among equals'), a title held by the patriarch of Rome prior to 1054. As one of the oldest surviving religious institutions in the world, the Eastern Orthodox Church has played an especially prominent role in the history and culture of Eastern and Southeastern Europe. Since 2018, there has been an ongoing schism between Constantinople and Moscow, with the two not in full communion with each other.

Eastern Orthodox theology is based on the Scriptures and holy tradition, which incorporates the dogmatic decrees of the seven ecumenical councils, and the teaching of the Church Fathers. The church teaches that it is the one, holy, catholic and apostolic church established by Jesus Christ in his Great Commission, and that its bishops are the successors of Christ's apostles. It maintains that it practises the original Christian faith, as passed down by holy tradition. Its patriarchates, descending from the pentarchy, and other autocephalous and autonomous churches, reflect a variety of hierarchical organisation. It recognises seven major sacraments (which are called holy mysteries), of which the Eucharist is the principal one, celebrated liturgically in synaxis. The church teaches that through consecration invoked by a priest, the sacrificial bread and wine become the body and blood of Christ. The Virgin Mary is venerated in the Eastern Orthodox Church as the Theotokos, which means 'God-bearer', and she is honoured in devotions.

On 5 January 2019, Bartholomew I, the Ecumenical Patriarch of Constantinople, signed the tomos that officially recognized and established the Orthodox Church of Ukraine and granted it autocephaly (self-governorship). The events immediately leading to the grant of autocephaly were:

• On 11 October 2018, the synod of the Ecumenical Patriarchate announced that it would "proceed to the granting of autocephaly to the Church of Ukraine", making it independent from the Russian Orthodox Church.
• This decision led the Holy Synod of the Russian Orthodox Church to break communion with the Ecumenical Patriarchate on 15 October 2018, which marked the beginning of the 2018 Moscow–Constantinople schism.
• On 15 December 2018 a unification council founded the Orthodox Church of Ukraine.
• On 5 January 2019, Patriarch Bartholomew signed the tomos of autocephaly of the Orthodox Church of Ukraine [uk].