Translate the following English sentence to French:
"The European Union must support that process and, if necessary, the Commission will have to take additional measures if the ICAO does not reach a satisfactory agreement."
L' Union européenne doit soutenir ce processus. Et s' il le faut, la Commission devra mettre en uvre des mesures complémentaires si l' OACI n' aboutit pas à un accord satisfaisant.