Oil company Rosneft plans to file a lawsuit against the US Treasury Department, the company's spokesman Mikhail Leontiev said. Rosneft decided to defend its interests in court after the agency's statement about the company's participation in the transportation of large batches of Iranian oil to Europe. When asked when the suit will be filed, Leontiev said that from the point of view of practical realization it is not worth to be ahead of the game.