Ukraine

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Challenger Alex Leapai from Australia-Samoa exercises during a public training ahead of his IBF, IBO, WBO and WBA heavyweight title bout against World boxing champion Wladimir Klitschko of Ukraine in Oberhausen, Germany, Wednesday, April 23, 2014. (AP Photo/Martin Meissner)

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Smoke billows from burning tires at a checkpoint after an attack by Ukrainian troops outside Slovyansk, Ukraine, on Thursday. Ukrainian troops moved against pro-Russia forces in the east of the country and killed at least five of them.

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National Edition News cover for April 25, 2014 - U.S. warns Russia on military posturing: Secretary of State John Kerry looks down as he adjusts the microphones before speaking about the situation with Ukraine and Russia from the State Department in Washington, Thursday, April 24, 2014. Kerry is accusing Russia of failing to live up to commitments it made to ease the crisis in Ukraine. (AP Photo/Jacquelyn Martin)

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Members of Ukrainian special forces man a check point near Donetsk, Ukraine, Thursday, April 24, 2014. Ukrainian forces launched an operation Thursday to drive pro-Russia insurgents out of occupied buildings in the country's tumultuous east, prompting new threats from Russian President Vladimir Putin. Within hours of the Ukrainian operation, which killed at least two pro-Russia militants, Russia's defense minister announced new military exercises for troops massed near Ukraine's border. (AP Photo/Manu Brabo)