seoul north korean workers operate kaesong industrial zone state-run web sit say friday joint venture south korea suspend last year amid disagreement north nuclear missile program south end decade cooperation factory park north korean side demilitarize zone dmz north launch rocket put object orbit close last remain window interaction two side time south korea say would long allow fund pay kaesong use north missile nuclear program since south korean official say evidence north korea divert wag pay workers south korean company operate park weapons program even see proud workers labour vigorously work kaesong industrial complex north korea propaganda web site meari arirangmeari.com say post date friday another propaganda web site uriminzokkiri say nobody business industrial complex nation sovereignty exercise u.s.-funded broadcaster radio free asia report monday north korean authorities operate 19 clothe factories within kaesong complex without inform south korean authorities cite unnamed source knowledge north korean matter china official south korea ministry unification say north korea must violate south korean firm property right within complex wire service yonhap report ministry could immediately reach comment reclusive north korea rich democratic south technically still war 1950-53 conflict end truce peace treaty recent weeks north korea launch two missiles japan conduct sixth nuclear test 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 pyongyang nuclear missile program pyongyang show interest dialogue u.s. president donald trump late dismiss prospect talk north korea waste time north korean workers operate close south-invested factory zone