RIYADH — Crown Prince Muhammad Bin Salman, deputy premier and minister of defense, held on Monday separate phone talks with the South African President Cyril Ramaphosa and Nigerian President Muhammadu Buhari, Saudi Press Agency reported. During his talks with the South African president, both the leaders reviewed bilateral relations and ways to enhance them. They also discussed issues of common concern. While in talks with the Nigerian leader, Crown Prince underlined the need for stability in the oil markets as both the leaders reviewed the OPEC+ agreement and the ways to further enhance mutual cooperation in this regard. They also discussed the ties between the two countries and the need to boost them.