Ukrainian Interior Minister Arsen Avakov named Vadym Troyan as head of the national police force on Monday after his predecessor Khatiya Dekanoidze resigned over MPs’ interference in her efforts to clean up corruption.
Mr Troyan was appointed Kiev’s chief of police in November 2014.
Before that, he was was deputy commander of the hardline nationalist Azov Battalion and an active member of the nationalist organization Patriots of Ukraine.
Several websites reported this year that Mr Troyan had organised surveillance of journalist Pavel Sheremet before his assassination in a car bombing on July 20.
Police later announced that an internal investigation had cleared Mr Troyan.