(LEAD) Economic revival appears to be behind N. Korea's push for dialogue with S. Korea: U.S. expert
(ATTN: ADDS expert comments on N.K. submarines in last 5 paras) By Chang Jae-soon WASHINGTON, Sept. 2 (Yonhap) -- North Korea is believed to have used the latest military standoff with South Korea to get inter-Korean talks started so as to win econom