washington china ambassador washington friday call unite state refrain make threats north korea day early launch another missile japan pacific ocean ambassador cui tiankai tell reporters embassy event honestly think unite state ... much real effective international cooperation issue refrain issue threats find effective ways resume dialogue negotiation say president donald trump others unite state beyond urge china increase diplomatic economic pressure communist ally help resolve standoff north korea weapons program china fight alongside north korea 1950-53 korean war chinese leader mao zedong lose eldest son beijing long pyongyang chief ally primary trade partner chinese government push back notion control pyongyang say unite state trump tweet early month unite state consider halt trade countries business north korea cui friday caution put china-u.s. trade table efforts undermine sino-u.s. trade even slap sanction china think would off-target chinese state news agency xinhua quote cui say friday chinese national day reception someone pressure china impose sanction china dprk would support many u.s. citizens cui say refer north korea acronym official name democratic people republic korea workers u.s. airplane factories farmers grow soybeans company sell smartphones china manufacturers enjoy large market share china company service sector gain trade surplus china u.s. state engage robust trade china would stand xinhua quote say china 's washington envoy say u.s. stop threats north korea