Ukraine Decides

A woman casts her ballot at a polling station in Kyiv. (Reuters/Viacheslav Ratynskyi)

A woman seen through a voting-booth curtain at a polling station in the village of Kosmach, western Ukraine. (Reuters/Kacper Pempel)

A Ukrainian serviceman studies presidential candidates at a polling station near the front line against Russia-backed separatists, in the village of Zaitseve, eastern Ukraine. (Reuters/Gleb Garanich)

An elderly woman examines her ballot paper in Maryinka, near Donetsk, eastern Ukraine. (AP/Evgeniy Maloletka)

Former Ukrainian Prime Minister and presidential candidate Yulia Tymoshenko casts her ballot at a polling station in Kyiv. (AFP/Sergei Gapon)

An elderly woman casts her ballot at home in Maryinka, eastern Ukraine. (AP/Evgeniy Maloletka)

Electoral workers prepare ballots at a polling station. (AP/Emilio Morenatti)

A little girl casts a man's ballot in Kyiv. (AFP/Sergei Supinsky)

A member of a local election commission carries a mobile ballot box during voting in the village of Kosmach, western Ukraine. (Reuters/Kacper Pempel)

A man prays before casting his ballot at a polling station in Kyiv. (AFP/Sergei Supinsky)

Ukrainian President Petro Poroshenko casts his ballot as his grandson, Petro, looks on, at a polling station in Kyiv. (AP/Efrem Lukatsky)

A view of a ballot box at a polling station in Kyiv. (AFP/Sergei Gapon)

Ukrainian servicemen sit in a truck to head to a polling station, near the front line with Russia-backed separatists, near Butivka, in eastern Ukraine. (AFP / Anatolii Stepanov)

Ukrainian comic actor and presidential candidate Volodymyr Zelenskyy casts his ballot at a polling station in Kyiv. (Reuters / Valentyn Ogirenko)

Kataryna Bidnosheya studies her ballot papers in the village of Velyki Dmytrovychi, central Ukraine. (EPA-EFE / Tatyana Zenkovich)

A Ukrainian government soldier casts his ballot at a polling station in Maryinka, eastern Ukraine. (AP/Evgeniy Maloletka)

An election observer signs a protocol during the Ukrainian presidential elections in the village of Velyki Dmytrovychi, some 40 km south of Kyiv. (EPA-EFE / Tatyana Zenkovich)

Ukrainian comic actor and presidential candidate Volodymyr Zelenskyy plays table tennis at his campaign headquarters in Kyiv. (Reuters / Valentyn Ogirenko)

Former Ukrainian Prime Minister and presidential candidate Yulia Tymoshenko speaks with supporters outside a polling station after casting her ballot in Kyiv. (AFP / Sergei Gapon)

Members of the electoral commission open a ballot box in Kyiv, March 31, 2019. (EPA-EFE / Tatyana Zenkovich)

Ukrainian comic actor and presidential candidate Volodymyr Zelenskyy delivers a speech as his wife Elena applauds following the announcement of the first exit poll, March 31, 2019. (Reuters / Valentyn Ogirenko)

Ukrainian President Petro Poroshenko gestures while speaking at his headquarters in Kyiv after the election, March 31, 2019. (AP/Efrem Lukatsky)

A journalist broadcasts a session of Ukraine's Central Electoral Commission live via a mobile phone in Kyiv, April 1, 2019. ( Reuters / Vasily Fedosenko)