According to Piskun, his dismissal by President Yushchenko in October 2005 came because he stopped criminal proceedings against
Yulia Tymoshenko and refused to drop proceedings against
Petro Poroshenko. He was criticized for closing the criminal case related to the
United Energy Systems of Ukraine while serving under
Viktor Yushchenko's government in 2005. and dropping criminal cases regarding back-then Prime Minister Yulia Tymoshenko. Piskun is the only Prosecutor General of Ukraine in Ukraine whose dismissals by two
Presidents have been overturned as unlawful by courts. The latest being a 24 April 2009 Kyiv Court of Appeals passing of a ruling saying President Yushchenko's decree dated 24 May 2007, dismissing Sviatoslav Piskun from the post of the prosecutor general was unlawful, ==Career since 2014==