On 17 April 1962, Genera! de Gaulle's proposal to establish a political union between the six EC Member States, better known as the 'Fouchet Proposal', was vetoed by Belgium and The Netherlands who made their further support dependent on British participation in the negotiations on a political union. This article examines the position of Belgium, represented by its Minister for Foreign Affairs, Mr. P-H. Spaak and more particularly its evolution from a rather favourable position to a rejection of the project. The contradictory Belgian demand for a more supranational political union at the same time as British membership can be considered in the light of Belgium's wish to promote both the process of European integration and the principle of Atlantic solidarity, the basis of its security. The article describes how the final deathblow to the negotiations was not given by Belgium and The Netherlands but by the French veto of British accession to the EC and the signing of the Franco-German Cooperation Treaty of Elysee in ]anuary 1963.