Detained Yukos chief resigns
Russian oil tycoon Mikhail Khodorkovsky has quit as chief executive of Yukos, the country's largest oil company.
Mr Khodorkovsky's resignation comes several days after he was jailed charged with seven counts including fraud and tax evasion.
Yukos and a smaller Russian rival Sibneft have completed a merger that creates the world's fourth-largest oil and gas producer.
The merger is to be finalised at a shareholders' meeting at the end of November.
