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Russian (R) and Crimean flags flutter on top of the Crimean government building near a statue of Vladimir Lenin in Simferopol on March 4, 2014. Fears of an assault by Russian forces on Ukrainian military bases surrounded in Crimea did not materialise overnight, a Ukrainian defence ministry spokesman said Tuesday. 'The night was quiet,' Vladyslav Seleznyov, the defence ministry spokesman for Crimea, told AFP in the regional capital Simferopol. AFP PHOTO / ALEXANDER NEMENOV (Photo credit should read ALEXANDER NEMENOV/AFP/Getty Images)
Russian (R) and Crimean flags flutter on top of the Crimean government building near a statue of Vladimir Lenin in Simferopol on March 4, 2014. Fears of an assault by Russian forces on Ukrainian military bases surrounded in Crimea did not materialise overnight, a Ukrainian defence ministry spokesman said Tuesday. 'The night was quiet,' Vladyslav Seleznyov, the defence ministry spokesman for Crimea, told AFP in the regional capital Simferopol. AFP PHOTO / ALEXANDER NEMENOV (Photo credit should read ALEXANDER NEMENOV/AFP/Getty Images)

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Crimea is entirely integrated into Ukraine's mainland economy and infrastructure. CNN's Isa Soares reports.