SEOUL -- South Korea and the United States have agreed to pursue a stand-alone agreement on cooperation for nuclear-powered submarines, with working-level talks expected to begin early next year, National Security Adviser Wi Sung-lac said Friday.Wi made the remarks after returning from a weeklong trip to the U.S., Canada and Japan, where he held meetings with U.S. Secretary of State Marco Rubio, who also serves as national security adviser, along with U.S. Energy Secretary Chris Wright during his stay in Washington.He said the two sides held "practical and in-depth consultations" on securit…READ FULL ARTICLE