The politicisation of the Common Foreign and Security Policy (CFSP) in the British domestic debate on Brexit: a challenge to EU-UK foreign and security cooperation.

The aim of this paper is to study the evolution of Britain's involvement in the EU's foreign and security policy in order to highlight the reasons that led the issue to be left out of talks on the post-Brexit future relation. The paper argues Europeanisation or de-Europeanisation largely depends on the degree of politicisation of issues both in the EU, the EU-27 and in the UK. As long as foreign and security issues remained relatively low key, the UK was able to enjoy the magnifying effect of its participation in the EU's Common Foreign and Security Policy (CFSP) and Common Security and Defence Policy (CSDP) and contributed to the decision-making process in order to successfully influence EU policies. Politicisation of foreign and security issues was due both to developments in EU-led or national initiatives and to the reaction they provoked in the UK. The EU insisted the UK was to be considered as a 'third country' and stressed the need for future cooperation to be institutionalised. On the contrary, in the UK, public distrust against a putative European 'super state', led successive governments to avoid any formal commitment to new EU initiatives. [ABSTRACT FROM AUTHOR]