council decis conclus agreement european commun hong kong china cooper mutual administr assist custom matter ec council european union regard treati establish european commun articl conjunct sentenc articl thereof regard propos commiss april council authoris commiss negoti behalf commun custom cooper agreement commun main trade partner agreement european commun hong kong china cooper mutual administr assist custom matter approv decid articl agreement european commun hong kong china cooper mutual administr assist custom matter approv behalf commun text agreement attach decis articl commiss assist repres member state repres commun joint custom cooper committe establish articl agreement articl presid council authoris design person empow sign agreement order bind commun articl presid council behalf commun give notif provid articl agreement articl decis publish offici journal european commun brussel council presid schomeru date entri forc agreement publish offici journal european commun gener secretariat council