Police have qualified the actions of presidential candidate and Radical Party leader Oleh Liashko, who demonstrated his ballot after voting, as a "violation of the secrecy of the vote." Ukrainian prosecutors will determine whether or not to pursue the case, Interior Ministry Communication's Department chief Artem Shevchenko has said.

During a briefing on Sunday in Kyiv, Shevchenko said police court react to the infraction.

"Certainly, it could be qualified, entered into the Unified Register of Pretrial Investigations, and then transferred under the jurisdiction of the Prosecutor General's Office (PGO).

Shevchenko said the infraction could be fall under Article 159 of Ukraine's Criminal Code (violation of the secrecy of the vote).

"If there is a re-qualification in relation to a person, then the investigation of persons with such status is exclusively the prerogative of the Prosecutor General’s Office. But the police will collect the primary information and, of course, qualify it," he said.

Liashko earlier in the day, in the presence of cameras and voters, displayed his ballot after he voted.

Ukraine is holding the first round of its presidential election on Sunday. The polling stations will close at 20:00. A record-large number of candidates – 39 - are running in this presidential election