Gromit's spot-on. In particular, Putin told the oligarchs he didn't care how rich they got but that politics was his job, not theirs. Some of them, however, forgot; once they got rich they got to thinking this made them fit to rule the country (despite the fact that they hadn't actually had to work at wealth, it was handed to them on a plate), and they started up political parties. Result: a lot of oligarchs behind bars. Google Khodorkovsky, for instance. Abramovich and Berezovsky are among those in exile in Britain, facing prosecution if they return, the poor dears.
It has been pointed out that most of those in trouble are Jewish; curious but I don't think it's any more than coincidence.