National Police Communications Department Director Yaroslav Trakalo told Interfax-Ukraine, Censor.NET reports.
"He came to the interview under subpoena issued in accordance with the procedure established by the Criminal Procedure Code. The relevant investigative actions are underway. The investigators continue checking obtained information," Trakalo said.
The documentary about investigation into Sheremet's murder carried out by OCCRP and Slidstvo.Info journalists shown May 10, 2017 suggests that Ustymenko, who was a member of the Security Service of Ukraine until 2014, spent several hours near Sheremet's house on the night when a journalist's car was rigged with explosives.
Ustymenko refused to comment on his ties with the SBU. Speaking with journalists, he failed to give a straight answer what he was doing near Sheremet's house on the eve of the journalist's murder. The SBU refuted allegations that its member was near Sheremet's house and specified that Ustymenko was dismissed on April 29, 2014.
President of Ukraine Petro Poroshenko said May 14 that the law enforcement bodies summoned Ustymenko for questioning on Monday.
May 15, Ukrainian Security Service Chief Vasyl Hrytsak said that his agency was ready to assist the National Police of Ukraine in finding Ustymenko, specifying however that the SBU was not authorized to question him.
As reported, May 10, OCCRP and Slidstvo.Info journalists made public their investigation of the murder of Pavel Sheremet, which was committed in Kyiv on July 20, 2016.
The prominent journalist Pavel Sheremet was killed in a car bombing in downtown Kyiv on Wednesday morning, July 20. According to witnesses, the explosion occurred when Sheremet stopped at an exit to a main road.
Related materials: Murder of Sheremet