The Orthodox Church of Ukraine is guided by the Holy Scriptures and the Holy Tradition, the canons of the Orthodox Church. Orthodox Christians of Ukraine are members of the OCU, regardless of their origin. Since, according to Tomos (decree of independence), the borders of the canonical territory of the OCU are determined by the borders of the Ukrainian state. Orthodox Ukrainians abroad are subject to the jurisdiction of the Patriarchate of Constantinople. The main church of the Orthodox Church of Ukraine is St. Michael's Golden-Domed Cathedral in Kyiv.