However , the Assembly of the Western European Union was retained to hold members to account for military missions .
As the Western European Union ( WEU ) was integrated into the European Union 's Common Security and Defence Policy , the European Parliament took on a greater role .
The Assembly of the WEU     was retained to hold members to account for military missions .
As the Western European Union ( WEU ) was integrated into the European Union 's Common Security and Defence Policy , the European Parliament took on a greater role .