(LEAD) N.K. leader may have discussed potential talks with U.S. during China visit: spy agency

North Korean leader Kim Jong-un likely communicated Pyongyang's stance on potential talks with the U.S. during his recent visit to China, according to South Korea's National Intelligence Service. The visit included senior diplomats rather than military officials, suggesting diplomatic intentions. China may relay Kim's position to the U.S. but is unlikely to actively mediate talks.