(4th LD) Park, Obama stand ready to engage N. Korea; urge N. Korea to give up nukes

(ATTN: CHANGES headline, lead; RECASTS throughout to highlight Obama's comment) By Kim Kwang-tae WASHINGTON, Oct. 16 (Yonhap) -- President Park Geun-hye and U.S. President Barack Obama Friday expressed willingness to engage North Korea, but made it c