Boris Rotenberg and his brother Arkady Rotenberg are Russian billionaires and childhood friends of President Vladimir Putin. OCCRP recently revealed in its Rotenberg Files that Arkady Rotenberg purchased and financed a chalet in Kitzbühel, Austria, through Cypriot companies. OCCRP also revealed that Spanish authorities seized a luxury villa belonging to Boris and Karina Rotenberg in Oliva, Spain, in October 2022.