Russia's Sistema sues Rosneft for $5.57 bn
Sistema said earlier it had filed a 330.5 billion rouble ($5.57 billion) lawsuit against Rosneft
 "Russia's Sistema sues Rosneft for $5.57 bn")
Russian industrial conglomerate Sistema does not rule out new lawsuits against oil giant Rosneft, a Sistema spokesman said on Friday.
Sistema said earlier it had filed a 330.5 billion rouble ($5.57 billion) lawsuit against Rosneft over Rosneft's acquisition of the Bashneft oil company.