Igor Rotenberg, aged 42, has acquired significant assets from his 63-year-old father, Arkady Rotenberg, a former judo partner of Putin. The older Rotenberg became a billionaire from business interests developed while Putin consolidated political power. The assets Arkady has sold to his son Igor include 79 percent of drilling company Gazprom Drilling (Bureniye); 28 percent of road construction company Mostotrest; and 33 percent in TPS Real Estate Holding. Igor Rotenberg, in a written statement, told Reuters: "Of course my father gave me a good start in business. Today I am an independent businessman and I am developing my assets with my team in a competitive, market environment."