The Committee of Voters of Ukraine has a graphic showing how many voters in Eastern Ukraine can cast ballots. In blue are the regions where there is little threat to go to polls, and orange is where there is a critical threat to voting. Yellow is the area where threats are in the middle. The NGO estimates that 42 percent can cast ballots in Eastern Ukraine, while 58 percent cannot.
Via Reuters, a member of an election commission carries documents and a mobile ballot box as he walks to visit local residents during a parliamentary election in the village of Semyonovka near Slavyansk in Eastern Ukraine.
Ukrainian Prime Minister Arseniy Yatsenyuk casts his ballot in Kyiv.
Hromadske TV is reporting almost 20 percent turnout by 1:30 p.m. local time:
Election returns from polling stations will come in after midnight, said the head of Ukraine's Central Elections Commission.
"I think that starting with midnight or one A.M. we will start receiving reports about the records of the election commissions - first from the smaller polling stations where ballot-counting will end sooner than at medium and large polling stations," CEC Head Mykhailo Okhendovsky said at a briefing in Kyiv, according to Interfax.
President Poroshenko has returned to Kyiv to vote, after making a surprise trip to the Donbas region.
"I am voting for our future, for the European direction in Ukraine's development and for government renewal. I am convinced that we will have a new government, a new pro-European coalition and a new parliament," he told reporters, according to Interfax. "I hope I will manage to form a powerful pro-European coalition, a pro-Ukrainian democratic coalition. I do hope that the Ukrainian people will make a very responsible choice today,"
Our correspondent Tom Balmforth is in Kyiv, talking to voters: