Stefano Pozzebon/Business Insider
That's largely down to Russia's chaotic 1990s. Enterprising and ruthless men (and they are practically all men) took hold of huge chunks of the former Soviet Union's rapidly privatised industries, or made millions bringing in highly sought-after exports from the west.
More recently, they haven't limited their interests to Russia. In the past 15 years, a handful of oligarchs have been snapping up companies in the West, too.
Some of the oligarchs no longer call Russia home: They have moved to the