Shark tanks, underground swimming pools, deluxe cars, a Qatari prime minister as a next-door neighbor and friends in diamond-dealing Russian mafia gangs: Ukraine's oligarchs, notorious for their dodgy deals and criminal associates, are a hardy bunch born from the ruins of the Soviet Union, and they know how to live in style. But now, as Ukraine finds itself center stage in a geopolitical tug-of-war between East and West, its elite class are facing the toughest challenge of their careers as they attempt to navigate the crisis with all their assets intact.