罗马天主教教宗方济各启程前往墨西哥,出访期间将在古巴停留,与俄罗斯东正教大牧首基里尔举行历史性会晤。Pope Francis, head of the Roman Catholic Church, has embarked on a trip that will take him to Mexico, with a stop in Cuba for a historic meeting with the head of the Russian Orthodox Church, Patriarch Kirill.