The top nuclear envoys of the rival Koreas will discuss terms for restarting long-dormant six-nation nuclear talks during a rare meeting in Beijing this week, a South Korean official said Sunday. North Korea abruptly walked out of the nuclear negotiations in April 2009 and prospects for their resumption diminished after two deadly incidents blamed on the North last year. In July, however, the chief nuclear envoys of the two Koreas met in Indonesia and agreed to work on restarting the talks, which also involve the United States, China, Russia and Japan. The two envoys South Korea's Wi Sung-lac and North Korea's Ri Yong Ho will meet again in Beijing on Wednesday to try to create an environment for the negotiations to resume, a South Korean Foreign Ministry official said on condition of anonymity in line with department policy.