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Pope Francis is urging world leaders to promote dialogue as a way of resolving the crisis in Ukraine.

Speaking to thousands of people in St. Peter's Square during his traditional Sunday midday appearance, he said: "I am making a heartfelt appeal to the international community: support every initiative for dialogue and harmony."

Francis urged all segments of Ukrainian society to work together to overcome their misunderstandings and build a future together.

Russian forces have effectively seized control of Ukraine's Crimean Peninsula after months of anti-government protests drove its pro-Moscow president out of the country.