Gazprom plus one share of Sakhalin Energy. In June 2007, TNK-BP, a subsidiary of BP plc, agreed to sell its stake in Kovykta field in Siberia to Gazprom after the Government of Russia questioned BP's right to export gas from Russia. On 23 June 2007, the governments of Russia and Italy signed a memorandum of understanding towards a joint venture between Gazprom and Eni SpA to construct a 558-mile (900 km) gas pipeline to carry gas per year from Russia to Europe. This "South Stream" pipeline would extend under the Black Sea to Bulgaria with a south fork to Italy and
Gazprom in the Nadym-Pur-Taz region (near the Gulf of Ob) in Yamalo-Nenets Autonomous Okrug in Western Siberia. Historically, the three largest fields are Medvezhe, Urengoy and Yamburg. After more than twenty years of production, the fields are now in decline. Production from the fields has decreased by twenty to twenty-five bcm per year. The production at Zaporliarnoe, Gazprom's fourth largest field, increased until 2004, offsetting the decline in the other fields. Since 2004, Gazprom has maintained production by activating new smaller fields and by purchasing production assets from other companies. Gazprom Neft produces crude oil. In 2005, Gazprom purchased 75 percent