FILE PHOTO: South Korea’s top refiner SK Energy’s main refinery is seen in Ulsan, about 410 km (256 miles) southeast of Seoul, February 25, 2009. REUTERS/Jo Yong-Hak (SOUTH KOREA)/File Photo
FILE PHOTO: South Korea’s top refiner SK Energy’s main refinery is seen in Ulsan, about 410 km (256 miles) southeast of Seoul, February 25, 2009. REUTERS/Jo Yong-Hak (SOUTH KOREA)/File Photo