Translate the following English sentence to French:
"Today, we are witnessing one of these cases, which, on the surface, may seem to be of minor importance and affect only the specific industry, but which, if it is allowed to pass without an authoritative intervention by the European Union, will become an unwritten rule which will cause problems for many of the Member States and the Union as a whole."
Parmi ceux-ci figure un cas qui peut sembler, en apparence, sectoriel et insignifiant, mais qui, s'il se produit sans que l'Union européenne n'intervienne de façon autorisée, deviendra une règle non écrite qui mettra en difficulté de nombreux États membres et l'Union dans son ensemble.