Clinton Appeals To North Korea For Closer Ties
Pres Clinton, speaking at joint appearance with South Korean Pres Kim Dae Jung in Seoul, makes unusual direct appeal to North Korea to set aside any nuclear ambitions in favor of strengthening ties to South Korea and US; says construction site in North Korea that could be beginnings of nuclear weapons plant and test firing last Aug of missile over Japan are 'cause for deep concern'; Clinton also comments on Iraq's refusal to comply with request from weapons inspectors; he urges caution and says it is 'important that we not overreact'; photo (M)