Pope Francis and Russian Orthodox Patriarch Kirill have called for restored Christian unity between the two churches at historic talks in Cuba.
The meeting was the first between a Pope and a Russian Church head since the Western and Eastern branches of Christianity split in the 11th Century.
In a joint declaration, they also urged the world to protect Christians from persecution in the Middle East.
The Pope has now arrived in Mexico for a five-day visit.
A crowd of 300,000 braved the cold in Mexico City to welcome him to the country which has the world's second largest Catholic population.