Russian prosecutors have arrested two associates of billionaire Viktor Vekselberg on bribery charges after masked officers raided his Renova conglomerate offices.The powerful Investigative Committee said on September 5 that the detained men -- Renova chief managing director Yevgeny Olkhovik and Boris Vainzikher, currently chief executive of Renova's T Plus Group -- were involved in bribing officials connected with a power-generation project in the remote Komi region.