Head of the Ukrainian central election commission Tetyana Slipachuk (L) and Director of "Ukraine" printing plant Yuri Onishchenko hold a ballot paper during its presentation in Kiev on March 21, 2019, ahead of the presidential election. - 39 canditates will take part in the Ukrainian presidential election of March 31, 2019. (Photo by Sergei SUPINSKY / AFP)

Head of the Ukrainian central election commission Tetyana Slipachuk holds a ballot paper during its presentation in Kiev on March 21, 2019, ahead of the presidential election. - 39 canditates will take part in the Ukrainian presidential election of March 31, 2019. (Photo by Sergei SUPINSKY / AFP)

Head of the Ukrainian central election commission Tetyana Slipachuk holds a ballot paper during its presentation in Kiev on March 21, 2019, ahead of the presidential election. - 39 canditates will take part in the Ukrainian presidential election of March 31, 2019. (Photo by Sergei SUPINSKY / AFP)

Head of the Ukrainian central election commission Tetyana Slipachuk holds a ballot paper during its presentation in Kiev on March 21, 2019, ahead of the presidential election. - 39 canditates will take part in the Ukrainian presidential election of March 31, 2019. (Photo by Sergei SUPINSKY / AFP)

Head of the Ukrainian central election commission Tetyana Slipachuk speaks during the presentation of the ballot paper ahead of the presidential election in Kiev on March 21, 2019. - 39 canditates will take part in the Ukrainian presidential election of March 31, 2019. (Photo by Sergei SUPINSKY / AFP)