In addition to its support for the common defence enshrined in Article 5 of the Washington Treaty and Article V of the modified Brussels Treaty, WEU takes an active role in conflict prevention and crisis management as provided for in the Petersberg Declaration.
I dteannta lena thacaíocht don chomhchosaint atá cumhdaithe in Airteagal 5 de Chonradh Washington agus Airteagal V de Chonradh na Bruiséile arna mhodhnú, glacann AIE rói gníomhach i gcosc coimhlinte agus i mbainistíocht géarchéime mar a fhoráiltear i nDearbhú Petersberg.