NUSA DUA, Indonesia (AFP) - North and South Korea said Friday they wanted to revive six-nation efforts aimed at curbing DPRK's atomic programme, after their envoys held unexpected and rare talks in Indonesia. The meeting between S. Korean nuclear envoy Wi Sung-Lac and his counterpart from the North, Ri Yong-Ho, also offered hope the rival nations may be willing to start improving ties after more than a year of high tensions. "I had a very constructive and useful conversation with my counterpart," Wi told reporters after the 2-hour meeting at a luxury resort in Bali on the sidelines of an ASEANsummit.