Russia's state-owned oil giant Rosneft has filed a lawsuit against Japanese and other participants of the Sakhalin-1 offshore oil and gas project, demanding some 89 billion roubles ($1.4 billion) for "unfounded" gains, a local court said Tuesday.The claim was filed against five entities, including Sakhalin Oil and Gas Development Co., in which Japan's economy ministry invests, and a unit of Exxon Mobil Corp. of the United States, according to the court in the Sakhalin region that received the complaint last Friday.The claims against Sakhalin Oil and Gas Development, in which major Japanese …READ FULL ARTICLE