Earlier on Wednesday, Unocal's board of directors recommended that shareholders accept a 17 billion US dollar takeover offer by larger oil producer Chevron Corporation.
In the email statement sent to CRI, CNOOC says it regrets that Unocal did not take up its offer and that it will continue to monitor the market.
CNOOC added that it considers its full-cash offer of 67 US dollars per share is still superior, even after Chevron raised its bid.
CNOOC last month proposed a merger with Unocal, offering 18.5 billion US dollars in total for Unocal's shares.




