seoul group south korean businessmen factories kaesong industrial complex inside north korea say wednesday want visit verify north claim restart operations south korea pull joint venture last year response north nuclear missile test end decade cooperation factory park north side demilitarize zone dmz last remain symbol inter-korean cooperation north korea state-run web sit say friday north korean workers operate district add nobody business industrial complex nation sovereignty exercise south koreans say would ask ministry unification permission visit south koreans obtain approval contact north koreans travel country two side technically still war 1950-53 conflict end truce treaty urge north immediately halt operation corporate assets say shin han-yong leader group use operate plant make fish net kaesong recent weeks north korea launch two missiles japan conduct sixth nuclear test sign may fast advance toward goal develop nuclear-tipped missile capable hit u.s. mainland u.s. secretary state rex tillerson say last weekend washington directly communicate north weapons program show interest dialogue south suspend operations industrial park say north divert wag pay workers south korean firm fund nuclear missile program july two months liberal president moon jae-in elect south government official say hard evidence back assertion moon initially seek engage north korea talk cooperation current political tensions tie president hand despite military tension businessmen visit come may provide chance restart talk north shin say know north accept trip time see u.s. dialogue partner pin hop one ten chance may exist say south koreans seek visit once-jointly run factory zone north