The continued meetings between the two religious leaders have provoked speculation about whether the two churches may one day be reunited after nearly 1,000 years of estrangement.
Orthodox Catholic Church
Top Catholic and Orthodox church officials in North America are calling on the Vatican to let married men become priests in Eastern rite Catholic churches, another sign that optional celibacy could become a front-burner issue under Pope Francis.
Eastern rite Catholic churches have a look and feel similar to Eastern Orthodox churches but are loyal to Rome and fall under the pope's jurisdiction.
Pope Francis will be accompanied on his first visit to the Middle East by Argentine Rabbi Abraham Skorka and Muslim leader Omar Abboud -- two friends from Buenos Aires.
It is the first time a pope has made an official visit accompanied by members of other faiths, and it underscores the interfaith focus of Francis' trip to the Holy Land, the Vatican said Thursday.
When Ecumenical Patriarch Bartholomew of Constantinople meets Pope Francis, they will discuss the "diminishing Christian minorities in the Middle East."
A Ukrainian Catholic priest in Crimea said church members are alarmed and frightened by the Russian military occupation and fear their communities might be outlawed again if Russian rule becomes permanent.
Fr. Mykhailo Milchakovskyi, a pastor in Kerch, Ukraine, described the atmosphere as tense because many residents of the town located in the eastern part of Crimea were unsure of their future.
"No one knows what will happen. Many people are trying to sell their homes and move to other parts of Ukraine," Milchakovskyi told Catholic News Service on Wednesday.