(LEAD) Park says unification of Korean Peninsula is fundamental solution to N.K. problems

(ATTN: ADDS more remarks from Park in paras 5-9)

By Song Sang-ho

ULAANBAATAR, July 16 (Yonhap) -- President Park Geun-hye on Saturday pointed to North Korea as a "missing link" in the effort to achieve a free, peaceful and interconnected Eurasia, say