NATO's 360-degree approach to security: alliance cohesion and adaptation after the Crimean crisis

In the mid-2010s NATO allies were facing the resurgence of a Russian threat at their borders, as well as terrorist actions in Europe and the MENA region. This evolving security environment provoked heated talks both within and outside NATO on its adaptation, often depicted as being the sign of irreconcilable disagreements. Conversely, this article argues that the "NATO 360-degree" concept adopted during the Warsaw Summit shows cohesion between the allies thanks to the Alliance's decision-making process. As a security community, member states were incentivised to find common grounds despite their diverging interests, which resulted in this new concept encompassing the "arc of insecurity". Its subsequent implementation also confirms the cohesion hypothesis, despite its obvious refocusing towards the East and collective defence. This article will first present the diverging threat perceptions within the Alliance. It will then focus on the implementation of the "NATO 360-degree" concept, promoted during the Warsaw summit, to finish with an initial assessment of the changes at work.