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    Ukraine Pres speaks out, challenges Russia

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Ukraine Pres speaks out, challenges Russia

EXCLUSIVE: Ukrainian President Petro Poroshenko speaks with CNN's Christiane Amanpour about the downing of MH17.

Ukraine Pres speaks out, challenges Russia

EXCLUSIVE: Ukrainian President Petro Poroshenko speaks with CNN's Christiane Amanpour about the downing of MH17.