sentences:  Due to refinery needs when making special qualities of commercial oils, Norway imported NOK 3.5 billion of foreign oil in 2015.In March 2005, Minister of Foreign Affairs Jan Petersen stated that the Barents Sea, off the coast of Norway and Russia, may hold one third of the world's remaining undiscovered oil and gas.Also in 2005, the moratorium on exploration in the Norwegian sector, imposed in 2001 due to environmental concerns, was lifted following a change in government.