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By Daryna Krasnolutska and Scott Rose, Bloomberg | August 15, 2014
By Olga Tanas and Volodymyr Verbyany, Bloomberg | August 7, 2014
By Leonid Bershidsky, Bloomberg | June 20, 2014
By Olga Tanas, Daria Marchak and Daryna Krasnolutska | May 8, 2014
By James G. Neuger, Henry Meyer and Elena Mazneva, Bloomberg | April 3, 2014