LONDON, ENGLAND - MARCH 09: Worshippers attend a mass in The Ukrainian Cathedral of the Holy Family in Exile, part of the Ukrainian Greek Catholic Church, led by Father Mykola Matwijiwskij in Mayfair on March 09, 2014 in London, England. The Russian military and allied militias have assumed control of Crimea, an autonomous region within Ukraine, ahead of a referendum to determine the province's nationality, which was called by the Crimean Parliament and which the government in Kiev regards as illegal. (Photo by Oli Scarff/Getty Images)
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