Ukraine is the world's 44th-largest country and the biggest country in Europe. The economy of Ukraine is an emerging free market, with a GDP that has experienced rapid growth in recent times. Ukraine is rich in natural, particularly in mineral deposits. Although oil reserves in the country are largely exhausted, it has other important energy sources, such as coal, natural gas, hydroelectricity and nuclear fuel raw materials. Ukraine is heavily dependent on Russia for its oil and gas requirement. The key exports include iron and steel, non-ferrous metals, petroleum and its products, food items, chemicals, heavy machineries, and transport equipments.