Ukrainian leaders launched national unity talks in Kyiv aimed at defusing the biggest crisis the country has faced in its modern history.
Ukraine Holds National Unity Talks

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Participants gathered on Wednesday, May 14 for talks on how to quell a pro-Russian rebellion in the east, but Kyiv's refusal to let separatists take part cast doubt on whether the meeting could defuse the crisis in Ukraine's capital, Kyiv, May 14, 2014.

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Acting Ukrainian President Oleksandr Turchynov (center) and Prime Minister Arseniy Yatsenyuk (left) take part in talks aimed at quelling a pro-Russian rebellion in the east, in Kyiv, May 14, 2014.

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A worker at the state-owned printing house inspects a ballot for the May 25 snap presidential elections with 21 candidates taking part, in Kyiv, May 14, 2014.

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Mykhaylo Okhendovsky, head of Ukraine's Central Election Commission, shows a long ballot with names of 21 presidential candidates, at a news conference, in Kyiv, May 14, 2014.