Translate the following English sentence to French:
"The Council has already, on various occasions, stated its conviction that the severe measures taken by NATO were both necessary and justified to deal with extremist and irresponsible actions involving clear violations of the United Nations Security Council resolutions."
Le Conseil a déjà manifesté à différentes occasions sa conviction que pour faire face aux actions extrémistes et irresponsables, qui violent clairement les résolutions du Conseil de sécurité des Nations unies, il a été nécessaire et justifié de recourir aux mesures sévères prises par l'OTAN.