beijing china rule communist party continue hold talk maintain contact north korean counterpart senior official say saturday describe two countries friendship important regional stability unite state ally many people china believe beijing rein pyongyang acceleration north korea nuclear missile capabilities coincide near-total breakdown high-level diplomacy two china pyongyang sole major ally say strictly enforce u.n. security council sanction ban import coal textiles seafood cut oil shipments north china account 90 percent world trade isolate country guo yezhou deputy head chinese communist party international department tell reporters sideline party congress exchange communication dialogue north rule workers party korea continue china north korea neighbour two traditional friendly cooperative relationship guo say maintain develop consolidate tie accord side interest also important mean regional peace stability add exchange two party play important role develop overall china-north korea relations guo say party workers party korea traditional friendly exchange level exchange happen depend side need side convenience add without elaborate guo directly answer question department head song tao last meet north koreans department charge party relations foreign political party traditionally serve conduit chinese diplomacy north korea workers party korea wednesday congratulate china 19th communist party congress despite increasingly fray relationships ally china tighten sanction pyongyang nuclear weapons program though china anger north korea repeat nuclear missile test demand stop beijing also see unite state south korea share responsibility rise tensions military drill north korea likely high agenda u.s. president donald trump visit china next month talk president xi jinping china 's communist party say still talk north korean counterpart