Russia
U.S.A. I am sure of it
The United States is the largest producer of both oil and natural gas in the world. Russia is the second-largest producer of both oil and natural gas.
Alberta is the leading producer of oil and natural gas.
The world's largest proven gas reserves are located in Russia, with 4.757 × 1013 m³ (1.6 × 1015 cu ft). Russia is also the world's largest natural gas producer, through the Gazprom company.
The largest oil producers (in order) are Saudi Arabia, Russia, US, Iran The largest natural gas producers are Russia, US, EU, Canada
The Arab Emirates
The leading producer of natural gas in Africa is Algeria. Algeria has an annual gas production of 82,760,000,000 and is the 9th leading producer in the world.
U.S.A. I am sure of it
The United States is the largest producer of both oil and natural gas in the world. Russia is the second-largest producer of both oil and natural gas.
United States of America
Alberta is the leading producer of oil and natural gas.
Russia, however, these statistics include ALL of Russia, not just European Russia. Norway is the leading (wholly European) producer of natural gas in Europe.
Netherlands
The leading producer of oil and natural gas in Latin America is Brazil. It has significant reserves and production capacity, particularly in offshore fields such as the pre-salt reserves.
The leading producer of natural gas in Africa is Algeria. Algeria has an annual gas production of 82,760,000,000 and is the 9th leading producer in the world.
Russia, however this includes all of Russia and not just European Russia. Norway would be the largest country by natural gas production wholly in Europe.
Lithuania :DThe country has only one natural gas suplier - Russian state controlled Gasprom, which keeps prices unbearable for the most of Central Eastern Europeans.