US Defense Secretary Jim Mattis says it is too early to tell if any of the overtures between North and South Korea during the Olympic Games are creating a chance for peace on the Korean Peninsula. <br/><br/>He, however, rejected any suggestion on Sunday that even a temporary warming of relations between the North and South could drive a wedge between Seoul and Washington. <br/><br/>His remarks came after North Korean dictator Kim Jong Un's sister, who is attending the Olympics, invited South Korea's president, Moon Jae-in, to visit Pyongyang. <br/><br/>Mattis is scheduled to meet in Rome with about a dozen defense ministers who are involved in the coalition fighting the Islamic State group in Iraq and Syria.