South Korean defense firms Hanwha Aerospace and Korea Aerospace Industries (KAI) said on Monday they will jointly develop a long-range air-to-air missile and cooperate on overseas marketing to expand exports of South Korean aircraft and air-launched weapons systems. Under a memorandum of understanding they signed a day earlier at the World Defense Show in Riyadh, Saudi Arabia, they will cooperate on integrating air-launched weapons into South Korea&rsq