Belgium–Luxembourg relations German-speaking municipality of Burg-Reuland in the province of Liège. Belgium–Luxembourg relations Belgium–Luxembourg relations are the bilateral relations between the Kingdom of Belgium and Grand Duchy of Luxembourg. Both countries have a history of close cooperation, notably within the Belgium–Luxembourg Economic Union, Benelux and within the European Union. Belgium has an embassy in Luxembourg and Luxembourg has an embassy in Brussels. The Belgian ambassador to Luxembourg is Thomas Antoine. The Luxembourg ambassador to Belgium is Jean-Jacques Welfring. Belgium and Luxembourg share a land border. On the Belgian side of the border, nearly all of it is with the province of Luxembourg;
Foreign relations of Belgium liberation of Belgium at the end of World War II. In March 1948 Belgium joined with France, Luxembourg, the Netherlands, and Britain in an agreement to establish a joint defense system. This agreement, known as the Treaty of Brussels, was a recognition that individual national responses to the threat of aggression were inadequate and that a united defense effort was necessary for mutual security. In 1948, after expressions of concern by several European states that the Treaty of Brussels was too limited in scope and effectiveness, the prime minister of Canada called for a mutual defense system comprising Western Europe