Gazprom Neft attempted a merger with Yukos that would have created Russia's largest oil company, YukosSibneft. The first attempt in 1998 failed over a management dispute, while second time round Sibneft's shareholders called off the deal in November 2003 after the federal government cracked down on Yukos despite the process already being well under way. In September 2005, Gazprom bought 75.7% of Sibneft's shares from Millhouse Capital (Roman Abramovich’s investment vehicle) for US$13.1 billion in Russia's largest corporate takeover. In May 2006, Sibneft was renamed Gazprom Neft. In 2006 Alexander Dyukov was elected as CEO of the company and in 2008 he
Kovykta field the field to state-owned Rosneftegaz, but failed. On 1 March 2011, Gazprom bought Rusia Petroleum's assets, including rights for the Kovykta field, for $711 million. The reserves of Kovykta amount to 2 trillion cubic meters of natural gas and more than 83 million tons of gas condensate. The period of active gas production in the Kovykta field is expected to be 30 years, and the period of field development about 50 years. The field was developed by Rusia Petroleum, 62.9% of which is owned by TNK-BP. 24.99% is owned by the power generating company OGK-3. The Kovykta field is considered