beijing china comprehensively implement unite nations sanction north korea spokesman ministry commerce say thursday commerce ministry spokesman gao feng tell reporters beijing u.n. sanction give cushion buff period implementation ban coal seafood import north korea comment response question data china customs administration show china import 1.6 million tonnes coal north korea august first since february beijing ban purchase fuel northeast neighbor aug. 14 commerce ministry say would allow cargoes already port clear customs usual u.n. sanction come force sept. 5. china say u.n. sanction north korea allow buff period coal seafood ban