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The Crimea was ceded to Ukraine as a gift from Russia by Nikita Khrushchev
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The world's worst nuclear accident occurred in Pripyat, Ukraine, north of Kiev
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President Yanukovych signs compromise deal with opposition leaders.
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Ukraine accused Russia of a "military invasion and occupation," saying Russian troops have taken up positions around a coast guard base and two airports on its strategic Crimea peninsula. Russia kept silent on the accusations, as the crisis deepened between two of Europe's largest countries.
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Russia's parliament granted Pres. Vladimir Putin permission to use the country's military in Ukraine and also recommended that Moscow's ambassador be recalled from Washington over comments made by Pres. Obama.
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Ukraine's ousted president, Viktor Yanukovych, said that he was "wrong" to invite Russian troops into Crimea, and vowed to try to persuade Russia to return the Black Sea peninsula.
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Ukrainian troops are overrun by the rebels at the long-fought-over Donetsk airport
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The leaders of Ukraine, Russia, Germany and France agree a deal to end fighting in eastern Ukraine at talks in Minsk, Belarus.
Was nown as February ceasefire -
Ukraine's military and pro-Russian rebels accused each other of intensifying attacks in separatist eastern territories despite a two-month-old ceasefire.
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In Ukraine US paratroopers began training local government forces who will fight pro-Russian separatists in the east, angering Moscow. The conflict is getting an international dimension.