Ecumenical Orthodox Patriarch Bartholomew I speaks with Ukrainian President Petro Poroshenko in Istanbul in April. Poroshenko visited in an effort to convince the patriarch to agree to a split, which he has described as 'a matter of our independence and our national security.' Moscow's Patriarch Kirill is planning to fly to Turkey in late August in a last-ditch bid to prevent it. | MIKHAIL PALINCHAK / PRESIDENTIAL PRESS SERVICE POOL PHOTO / VIA AP