common posit april defin council basi articl treati european union regard extens suspens restrict trade feder republ yugoslavia serbia montenegro cfsp council european union regard treati european union articl thereof regard resolut adopt septemb januari april unit nation secur council defin common posit articl accord resolut adopt septemb januari april unit nation secur council suspens restrict trade feder republ yugoslavia serbia montenegro extend articl common posit publish offici journal brussel april council presid juppé