(LEAD) (News Focus) Leadership vacuum adversely affects S. Korea's diplomatic landscape
(ATTN: RECASTS 2nd para)
By Koh Byung-joon
SEOUL, Dec. 9 (Yonhap) -- The leadership vacuum created by the impeachment of President Park Geun-hye is expected to darken the already bleak diplomatic landscape for South Korea, making it tougher to get ov