A nine billion dollars stake in one of the world’s biggest oil companies may not be enough for CEFC China Energy.A week after China’s largest private energy company struck a deal for a chunk of Rosneft PJSC, it’s been pegged as a possible investor in a Russian metals and power business and a free-trade zone in Georgia’s Black Sea port of Poti.The Rosneft deal has thrust CEFC into the spotlight, transforming it from an obscure conglomerate focused mainly on the former Soviet Union and eastern