The presidents of the United States and South Korea agreed yesterday to push for an early resumption of six-nation talks to end North Korea's nuclear weapons programmes. Bush called South Korean President Roh Moo-hyun to discuss the importance of restarting six-nation talks to rein in North Korea's nuclear ambitions. "President Roh said the six-party talks must resume soon for a peaceful resolution of the North Korean nuclear problem," the presidential Blue House said. "South Korea and the US must co-operate and all participants of the talks must boost their efforts to this end." Bush shared that view during the 10-minute phone conversation, and suggested that he and "President Roh closely co-operate for the peace of the world," it said.