After that, he began a massive filing of applications with the State Bureau of Investigation a statement against former President Poroshenko: accusations of "criminal actions" during the 2018 Kerch Strait incident, "economic crimes", illegal purchase of the Pryamiy kanal TV channel, "seizure of power" during the election of the Groysman Government in 2016. This activity was approved by the business partner of President Zelensky, Kolomoisky, who also had a conflict with Poroshenko during the latter's presidency. At the same time, he was summoned for interrogation in cases of murders during the Euromaidan as a witness. St the same time, he was lobbying for the closure of criminal cases against video blogger Anatoliy Shariy and the editor-in-chief of Strana.ua, Huzhva. He also openly clashed with Prosecutor General Ruslan Riaboshapka. Viktor Andrusiv, the executive director of the Ukrainian Institute of the Future, accused Prosecutor General Yuriy Lutsenko of inaction because Portnov had returned freely and had not been summoned for questioning, including on the January 16 laws. Lutsenko wrote in response: "Do you have evidence of a crime committed by him?" On May 20, Portnov stated that he was guarded by Ukrainian law enforcement.