Back in Paris, he ran up against the suspicions of the professional and institutional judo milieu. His hopes of ultimately heading up the French Judo Federation were foiled, despite the publication in November of his book Les Fondements du Judo (The Foundations of Judo) with the Grasset publishing house. (A treatise on judo illustrated with photographs of Yves Klein and other judokas doing Katas). Yves decided to leave France for Spain at the invitation of the publisher Fernando Franco de Sarabia.