US promises new North Korea plan after two decades of 'failure'

The United States on Thursday vowed a fresh strategy to counter the North Korean nuclear threat, admitting that all previous efforts had failed.During a visit to Japan at the start of an Asian tour, Secretary of State Rex Tillerson said he would urge China to play its part in reining in its neighbour.In his first foray into crisis diplomacy, the new US envoy wants to reassure key Asian allies that Washington stands with them in the face of the accelerating nuclear and missile threats.