Voting in the run-off round of the presidential election has started in Ukraine.

Creative director of Studio Kvartal 95 Volodymyr Zelensky, who was nominated by the Servant of the People Party, and incumbent President Petro Poroshenko will compete in the runoff.

There are two candidates – creative director of Studio Kvartal 95 Volodymyr Zelensky, nominated by the Servant of the People Party, and incumbent President Petro Poroshenko.

For the April 21 election, 199 constituencies have been created throughout Ukraine, in addition to a foreign constituency, totaling 29,982 polling stations. The estimated number of voters included in the lists in these constituencies is 30,311,492. Some 449,175 Ukrainians plan to vote abroad.

There could have been 223 districts, but there are none in Russia-annexed Crimea and in Russia-occupied areas of Donetsk and Luhansk regions.

Ukrainians citizens will not be able to vote in Russia, because at the end of 2018 Ukraine's Central Election Commission (CEC) eliminated all five foreign polling stations in Russia created in 2012 on a permanent basis. These sites are transferred to the embassies of Ukraine in Georgia, Kazakhstan, and Finland.

Voters were able to change their permanent place of voting until March 15 without changing their voting address. Some 325,604 Ukrainians took advantage of this right.

The CEC registered 2,485 official election observers from international organizations and 215 from foreign countries. The CEC refused to register any observers from the Russian Federation.

The presidential election will be monitored by 82,265 observers from public organizations. Most of the observers are from the Ukrainian Center for Democratic Society (27,610 people), the Ze!Team (11,128), Ukrainian NGO Solidarity Youth (7,276), NGO Advanced Legal Initiatives, or PPI (6,699), the Opora Civic Network (4,943).

There are 33,851 official observers from candidate Poroshenko, 3,526 from Zelensky and 10 more from his Servant of the People Party.

The National Exit Poll 2019 consortium, which includes Ilko Kucheriv Democratic Initiatives Foundation, Kyiv International Institute of Sociology (KIIS) and Oleksandr Razumkov Ukrainian Center for Economic and Political Studies, will conduct a national exit poll on the day of the run-off election.

The Television News Service (TSN) on 1+1 TV channel will present the results of its own exit poll conducted by the research companies Kantar TNS and Info Sapiens upon request of the channel.

The TV channel 112.Ukraine on Election Day will also announce the results of its exit poll, which will be conducted by the New Image Marketing Group. The exit poll was commissioned by the American company Global Management Association and the British publication The Independent.

The CEC should establish within 10 days from the day of voting (up to and including May 1) election results and draw up a corresponding protocol.

The winner of the election is the candidate who scored more votes than the other candidate. If candidates receive the same number of votes, then the vote is recognized as invalid.

The inauguration of the newly elected President of Ukraine should take place no later than June 3, 2019.