(LEAD) U.S., South Korea need to further strengthen alliance against many challenges: Mark Lippert
(ATTN: ADDS more remarks, photo)
By Koh Byung-joon
INCHEON, Jan. 20 (Yonhap) -- Time is of the essence in dealing with geopolitical and security challenges facing the Northeast Asian region, the outgoing top U.S. envoy to South Korea said Friday, add