Saudi Crown Prince Mohammed bin Salman (C) talks with a guest during the 39th Gulf Cooperation Council (GCC) summit in Riyadh, Saudi Arabia, on Dec. 9, 2018. The 39th Gulf Cooperation Council (GCC) summit kicked off on Sunday in Riyadh. The one-day annual summit is expected to discuss regional and international issues to promote political, defense, economic and legislative integration and cooperation among GCC member states, Saudi Press Agency (SPA) reported. (Xinhua/Tu Yifan)