In Versailles on Monday 6 March by invitation of the French President, with less than 20 days to go until the celebrations of the 60th anniversary of the Treaty of Rome, the French, German, Italian and Spanish leaders, called for a European Union with ambitious common objectives capable of progressing with differing levels of integration.
All four of them spoke in favour of the idea of "differentiated cooperation", particularly in the fields of defence, the Eurozone and Economic and Monetary...