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 Promgaz for gas supply of South Ossetia and Armenia. Gazprom Promgaz plans gas transportation and its distribution systems, as well as investigating various research in the field of natural gas. The company is the general planner of the natural gas supply program for Russian regions, developed by Gazprom. The company is also a research center of Gazprom in the field of regional power systems, the supply, distribution and use of gas, efficient energy use and energy-savings, price setting for construction of gas industry objectives, the development of regional hydrocarbon fields and development of non-traditional hydrocarbon resources including coal bed methane. Gazprom