From the Central Election Commission: "no systemic violations" had been reported.
“There are isolated instances, but they are classic for any voting process in any election campaign,” CEC Secretary Natalia Bernatska told journalists.
The commission updated that figure to "more than 45 percent."
Some turnout information from our news desk: By midafternoon (1500 in Ukraine), more than 44 percent of eligible voters had cast ballots, according to the Central Election Commission.
From our Moscow correspondent:
Another look at that very long ballot paper:
An update on reported election violations from our news desk:
The police have so far registered more than 500 reports of election violation, the press service of the Ukrainian Interior Ministry reported in a Twitter post.
"As of 14:00, the police have registered 522 complaints and reports related to the electoral process," it said.
The greatest number of violations were registered in Kyiv, the Donetsk, Kharkov, and Dnepropetrovsk regions, the ministry said.
The police added that it had opened eight criminal cases over electoral violations.