The Documents Speak:
In the context of the study undertaken by the Ecumenical Patriarchate for the granting of the ecclesiastical status of autocephaly to Ukraine, various opinions have been formulated—even by representatives of official institutions—expressing misgiving about the canonical prerogative of the Church of Constantinople to proceed with such an act. The principal argument proposed in this regard is that Ukraine “constitutes the canonical territory of the Patriarchate of Moscow” and that, consequently, such an act on the part of the Ecumenical Patriarchate would comprise an “intervention” into a foreign ecclesiastical jurisdiction.
Therefore, it has been deemed necessary for the Ecumenical Patriarchate to remind everyone of the historical and canonical truth with regard to the relationship of the Church of Constantinople to the Church of Ukraine as derived from the surviving formal documents, which unfortunately are either disregarded or else deliberately obscured for apparent reasons.
Source: Greek Orthodox Archdiocese of America