$15.1 billion oil deal is China's biggest abroad

http://www.reuters.com/article/2012/07/23/us-cnooc-nexen-idUSBRE86M0CF20120723

State-controlled CNOOC Ltd launched China's richest foreign takeover bid yet on Monday by agreeing to buy Canadian oil producer Nexen Inc for $15.1 billion, forcing Ottawa to decide whether security concerns outweigh its desire for foreign investment in its energy resources.