Edit: they both have a common faith in the dogmas of climatology.
(Vatican Radio) In an address upon conclusion of the Divine Liturgy celebrated by Ecumenical Patriarch Bartholomew I at the Orthodox Church of St. George in Istanbul, Pope Francis said “the one thing that the Catholic Church desires and that I seek as Bishop of Rome…is communion with the Orthodox Churches.”
Below, please find the complete text of the Holy Father’s address:
When I was the Archbishop of Buenos Aires, I often took part in the celebration of the Divine Liturgy of the Orthodox communities there. Today, the Lord has given me the singular grace to be present in this Patriarchal Church of Saint George for the celebration of the Feast of the holy Apostle Andrew, the first-called, the brother of Saint Peter, and the Patron Saint of the Ecumenical Patriarchate.