(LEAD) S. Korea, U.S. chief negotiators on N. Korea to hold talks this week
(ATTN: UPDATES last 3 paras with Yun's arrival)
SEOUL, Oct. 31 (Yonhap) -- The chief South Korean and U.S. negotiators on North Korea's nuclear program will hold talks in Seoul this week to discuss a range of issues pertaining to North Korea and its