CNPC seen tapping Exxon-Rosneft assets

    By Aibing Guo & Zijing Wu     China National Petroleum Corp. already spent more money this year on energy assets than any other global producer. Oil and gas fields controlled by Exxon Mobil Corp. (XOM) and Russia’s OAO Rosneft may be next on the list.     China’s largest oil producer, known as CNPC,...