Strategic analysis and the concept of security have undergone a major evolution since the end of the Cold War. Nowadays, threats are no longer exclusively location-based, but have become more horizontal and less defined. Their orientation assumes a hybrid shape, and they are becoming more difficult to frame, assess, and face. It is in this security context that NATO and the EU operate, a multipolar international system with players making use of unconventional warfare techniques, from the use of deniable proxies to new forms of pressure (e.g., energy supplies, foreign media control and propaganda, mobilisation of ethnic minorities abroad, cyber-attacks) to achieve their foreign policy goals.