Presidential Voting Under Way in Tense Ukraine

People queue to collect their ballot papers during voting in a presidential election at a polling station in Kyiv, May 25, 2014. Ukrainians voted in a presidential election billed as the most important since they won their independence from Moscow 23 years ago.

People cast their ballots during voting in a presidential election at polling station in Kyiv.

Ukraine's presidential candidate Yulia Tymoshenko casts her ballot as her husband Oleksandr, right, and daughter Yevgenia assist her at a polling station during presidential election in Dnipropetrovsk.

Ukraine's Prime Minister Arseny Yatseniuk (R) accompanied by his wife Teresiya (C) speaks to journalists after voting in a presidential election at polling station in Kyiv.

A Ukrainian soldier waits outside voting booths at a polling station in the village of Desna in the Chernihiv region.

Pro-Russian militants smash ballot boxes in front of the seized regional administration building in Donetsk. Ukraine's critical presidential election got underway under the wary scrutiny of a world eager for stability in a country rocked by a deadly uprising in the east.

Presidential candidate Petro Poroshenko, left, and his wife Maria, right, cast their ballots at a polling station  in Kyiv.

Darth Vader, the Ukrainian Internet Party candidate for Kyiv's mayor, waits to receive his ballot at a polling station in Kiev.

A woman reads her ballot at a polling station in Mariupol.

People queue to receive their ballot papers at polling station in the village of Kosmach in the Ivano-Frankivsk region of western Ukraine.

An election official sits in front of a wall covered with information of candidates at a polling station in the eastern Ukrainian town of Krasnoermeisk (Red Army), northwest of Donetsk.

An elderly woman casts her vote in the presidential election in the eastern town of Krasnoarmeisk.