Pope Francis returns on Sunday to Lesbos, the Greek island at the heart of Europe's migration debate.
The visit comes after Francis pointedly criticised European governments for their current handling of migrants during his visit to the region.
In Cyprus on Friday, he denounced the "culture of indifference" shown to migrants, and in Athens on Saturday he urged European governments to take in migrants "in proportion to each country’s means."
"Europe continues to stall, falling prey to forms of nationalistic self-interest rather than being an engine of solidarity. At times, it appears faltering and uncoordinated," he said.
"In the past, ideological conflicts prevented the building of bridges between eastern and western Europe. Today the issue
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