Translate the following English sentence to French:
"At the time that the UN Balkans Task Force provided its original assessment of the environmental damage arising as a result of the Kosovo conflict, it had not received any official document confirming whether or not depleted uranium had been used during the conflict."
À l'époque de la publication par la task-force "Balkans" des NU de son rapport d'évaluation sur les incidences environnementales de la guerre du Kosovo, celle-ci n'avait reçu aucun document officiel confirmant ou infirmant l'utilisation d'uranium appauvri durant le conflit.