Original: The Western European Union (WEU; French: Union de l'Europe occidentale, UEO) will be until June 2011 an international organization tasked with implementing the Modified Treaty of Brussels (1954), an amended version of the original 1948 Treaty of Brussels.
Simplified: The Western European Union (WEU) is a European defense and security organization. It was set up by Treaty of Brussels of 1948, West Germany and Italy joined in 1954.