 Prüm sought to improve relations with France and Germany, which had been alienated by the formation of the Belgium-Luxembourg Economic Union in 1921.On 9 October, Prüm negotiated a working arrangement on the co-ordination of iron production in France and Luxembourg.At the same time, the Locarno Treaties were signed between seven European states (not including Luxembourg); the treaties confirmed the inviolability of the borders redrawn by the Treaty of Versailles.