Tillerson urges China, Russia to do more to halt North Korean nuclear threat

US Secretary of State Rex Tillerson called on China and Russia to take more measures aimed at halting North Korea’s nuclear weapons programme and said the US will not negotiate with the country until Pyongyang stops “threatening behaviours”. “A sustained cessation of North Korea’s threatening behaviours must occur before talks can begin,” Tillerson said at a United Nations Security Council meeting to discuss the country’s nuclear weapons programme…