Translate the following English sentence to French:
"Not only do these decisions conflict with the Treaty and apportion to the institutions of the Union more power than that to which they are entitled but, worst of all, their effect will be counter-productive."
Les adoptions de ce jour sont non seulement contraires au Traité et octroient aux organes de l'Union davantage de pouvoirs que ceux qui lui reviennent, mais surtout, elles produiront un effet contraire.