washington unite state tuesday impose sanction 13 chinese north korean organizations washington accuse help evade nuclear restrictions pyongyang support country trade commodities like coal u.s. treasury announce action one day president donald trump put north korea back list state sponsor terrorism website new curb show trump administration focus hurt trade china north korea see key deter pyongyang ambition develop nuclear-tipped missile capable hit unite state designation impose sanction penalties north korea relate persons support maximum pressure campaign isolate murderous regime say treasury secretary steven t. mnuchin late sanction include blacklist three chinese company dandong kehua economy trade co. dandong xianghe trade co. dandong hongda trade co. treasury department say do 750 million combine trade north korea almost five years aug. 31. say involve trade coal iron ore lead zinc silver ore lead metal ferrous products well notebook computers sanction also blacklist sun sidong company dandong dongyuan industrial co. june report washington think tank c4ads say firm part interconnect network chinese company account vast share trade north korea u.s. authorities repeatedly target company individuals chinese city dandong border north korea bid cut pyongyang major export revenue sell natural resources coal beijing foreign ministry spokesman lu kang reiterate china opposition unilateral sanction countries add could investigate contravention laws international obligations party wish effective cooperation china issue really grasp certain matter totally share intelligence china cooperate china appropriately handle issue lu tell daily brief wednesday direct impact list company may limit trade china isolate northern neighbor slow substantially since unite nations impose ban september north korean export coal iron iron ore lead lead ore seafood february china also prohibit coal purchase north korea china strictly enforce financial rule dandong area say anthony ruggiero north korea expert foundation defense democracies result dandong draw company interest make profit sell north korea say new sanction also hit several north korean company send workers countries russia poland cambodia china unite state authorities say seek cut money north korea make export labor besides target source weapons technology curb first time unite state seek directly attack north korea daily consumer trade say peter harrell sanction expert center new american security sanction company involve ordinary trade harrell say logical next step sanction aim isolate pyongyang say heather nauert state department spokeswoman add think target chinese firm would affect beijing cooperation north korean issue think jeopardize anything say think world come together issue good relationship china go change u.s. sanction 13 chinese north korean organizations