Constantinople In 2018, the Moscow Patriarchate's traditional rivalry with the Patriarchate of Constantinople, coupled with Moscow's anger over the decision to grant autocephaly to the Ukrainian church by the Ecumenical Patriarch, led the ROC to boycott the Holy Great Council that had been prepared by all the Orthodox Churches for decades. The Holy Synod of the ROC, at its session on 15 October 2018, severed full communion with the Ecumenical Patriarchate of Constantinople. The decision was taken in response to the move made by the Patriarchate of Constantinople a few days prior that effectively ended the Moscow Patriarchate's jurisdiction over Ukraine and promised autocephaly to Ukraine, the ROC's and the Kremlin's fierce opposition notwithstanding. While the Ecumenical Patriarchate finalised the establishment of the Orthodox Church of Ukraine on 5 January 2019, the ROC continued to claim that the only legitimate Orthodox jurisdiction in the country, was its branch. Under a law of Ukraine adopted at the end of 2018, the latter was required to change its official title so as to disclose its affiliation with the Russian Orthodox Church based in an "aggressor state". On 11 December 2019 the Supreme Court of Ukraine allowed the Ukrainian Orthodox Church of the Moscow Patriarchate (UOC-MP) to retain its name. In October 2019, the ROC unilaterally severed communion with the Church of Greece following the latter's recognition of the Ukrainian autocephaly. On 3 November, Patriarch Kirill failed to commemorate the Primate of the Church of Greece, Archbishop Ieronymos II of Athens, during a liturgy in Moscow. Additionally, the ROC leadership imposed pilgrimage bans for its faithful in respect of a number of dioceses in Greece, including that of Athens. On 8 November 2019, the Russian Orthodox Church announced that Patriarch Kirill would stop commemorating the Patriarch of Alexandria and all Africa after the latter and his Church recognized the OCU that same day. On 27 September 2021, the ROC established a religious day of remembrance for all Eastern Orthodox Christians which were persecuted by the Soviet regime. This day is the 30 October. Russian invasion of Ukraine, 2022 Metropolitan Onufriy of Kyiv, primate of the Ukrainian Orthodox Church (Moscow Patriarchate) (UOC-MP) called the war "a disaster" stating that "The Ukrainian and Russian peoples came out of the Dnieper Baptismal font, and the war between these peoples is a repetition of the sin of Cain, who killed his own brother out of envy. Such