A N A LY S I S PEACE AND SECURITY EUROPEAN SECURITY AFTER BREXIT A British, French and German Perspective Jean-Pierre Maulny, Marius Müller-Hennig, Neil Melvin and Malcolm Chalmers December 2020 Brexit poses a risk for Euro­pean Security as the highly institutionalised relations based on EU membership change, and prevailing cer­tainties seem to disappear. As maintaining strong links and a close relationship on ­foreign and security policy is in the interest of all three coun­tries, smaller and more infor­mal alliances like the E3, a setting of trilateral relations between the UK, France and Germany, will gain importance. Careful considerations, regar­ding the institutional frame­work and governance, but also possible fields of cooperation, need to be taken to make this triangle a functional and effec­tive setting. Differences in thre­at perception and strategic cul­ture and interests can be seen as a blessing in disguise.