A South Korean energy group is to invest $2 billion as part of a project to develop three oil fields in the United Arab Emirates, officials said Monday. The state-run Korea National Oil Corp. and energy firm GS Energy will hold a combined 40 percent stake in the $5 billion project, with Abu Dhabi National Oil Co. taking the remaining stake, the Knowledge Economy Ministry said. The development of the oil fields -- two of them onshore and one offshore -- will start this month, it said, adding that the project is expected to see output of 43,000 barrels per day once production begins as early as 2014. Under the 30-year deal, South Korea will take 17,000 barrels of oil per day and will be allowed the entire output in case of emergency, it said. South Korea, the world\'s fifth-largest oil importer, buys almost all of the crude it need from overseas and has been trying to secure its own energy sources abroad.