Translate the following English sentence to French:
"In addition, closer cooperation is being gambled on heavily but it is being forgotten that this would require the establishment of a multi-speed Europe which would inevitably have a hard core and an unacceptable political directorate."
D' autre part, on mise gros sur les coopérations renforcée, mais on oublie qu' elles représenteraient la consécration d' une Europe à plusieurs vitesses, à laquelle serait inévitablement associé un noyau dur et un inacceptable directoire politique.