In March 2006 he was elected as a people's deputy of the Verkhovna Rada from Party of Regions list as No.96 – but he was not a party member. Piskun was elected in parliament for Party of Regions again in 2007. He became a full member of Party of Regions in October 2008. Piskun did not return to parliament after the 2012 Ukrainian parliamentary election after losing in single-member districts number 63 (first-past-the-post wins a parliament seat) located in Zhytomyr Oblast. In the 2014 Ukrainian parliamentary election Khoroshkovskyi tried to return to national politics this time from the party of Strong Ukraine (placing 16th on the parties election list). But in the election the party failed to clear the 5% election threshold (it got 3.11% of the votes) and thus Piskun was not elected into parliament. Piskun was only allowed to take part in the election after a court decision validated his entrance in the election, at first the Central Election Commission of Ukraine had refused to register him because in the last 5 years leading up to the election he had not lived in Ukraine.
