Eavesdropping equipment has been found in the office of the head of the Special Anticorruption Prosecutor's Office, Nazar Kholodnytskyy, according to sources quoted by Obozrevatel and Ukrainian News.
The device was reportedly installed in an aquarium.
Obozrevatel said it belonged to the National Anticorruption Bureau of Ukraine.
Earlier on 20 March, media reported that Kholodnytskyy may step down soon over health problems.