Translate the following English sentence to French:
"The future of the development of Europe and the validity and sustainability of the institutions of the Union is at stake, with the now sure and fast-approaching prospect of enlargement to include a further 12 countries, and our relations with the citizens and their approval and support are also at risk."
Sont en jeu l'avenir de la construction européenne, la validité, la durabilité des institutions de l'Union dans la perspective, désormais concrète et plus proche, de l'élargissement à douze autres pays et le rapport avec les citoyens, leur consentement et leur soutien.