http://www.economist.com/news/business/21643122-how-businesses-linked-blacklisted-oligarchs-avoid-western-sanctions-fancy-footwork
But this approach increases uncertainty for Western companies that do business (or are considering transactions) with such firms. Faced with this, many have felt obliged to hire investigators like those who looked into Sogaz’s affairs. This is costly, and even seasoned sleuths are often unable to give firm assurances about ownership and control, given Russian business’s widespread use of offshore jurisdictions