▁been ▁export ed , ▁and ▁the ▁company ▁did ▁not ▁get ▁a ▁permit ▁for ▁similar ▁operations ▁in ▁the ▁following ▁year . ▁ ▁Y uk os ▁was ▁Vol got ank er ' s ▁largest ▁customer ▁as ▁well ▁as ▁a ▁major ▁share holder . ▁As ▁Y uk os ▁started ▁having ▁problems ▁with ▁the ▁government ▁in ▁the ▁mid - 2 0 0 0 s , ▁it ▁was ▁replaced ▁with ▁Ros ne ft ▁as ▁the ▁main ▁customer . ▁ ▁In ▁ 2 0 0 4 , ▁Vol got ank er ▁itself ▁has ▁been ▁charged ▁with ▁tax ▁ev asion ▁and ▁lev ied ▁a ▁fine ▁of ▁$ 2 3 ▁million . ▁After ▁a ▁few ▁rock y ▁years , ▁the ▁company ▁was ▁eventually ▁placed ▁into ▁bank rupt cy ▁in ▁ 2 0 0 7 , ▁and ▁sales ▁of ▁assets ▁were ▁imp ending ▁as ▁of ▁the ▁summer ▁ 2 0 0 7 . ▁On ▁November ▁ 1 1 , ▁ 2 0 0 7 , ▁one ▁of ▁their ▁boats , ▁Vol g one ft - 1 3 9 , ▁broke ▁apart ▁in ▁the ▁Ker ch ▁Stra it , ▁sp illing ▁at ▁least ▁ 1 , 3 0 0 ▁tons ▁of ▁fuel ▁oil ▁into ▁the ▁sea . ▁ ▁On ▁March ▁ 4 , ▁ 2 0 0 8 , ▁the ▁company ▁was ▁declared ▁bank rupt ▁by ▁a ▁Russian ▁court . ▁ ▁The ▁fleet ▁▁ ▁As ▁of ▁the ▁mid - 2 0 0 0 s , ▁the ▁company ▁controlled ▁ 7 0 % ▁of ▁liquid ▁cargo ▁transport ation ▁market ▁in ▁the ▁bas in ▁of