The security environment in Europe has and is still experiencing significant changes in its configuration. If the 2016 referendum and the United Kingdom’s exit from the Europe- an Union – the so-called Brexit – significantly altered the nature and level of defence cooper- ation on the continent. Seemingly in the long term, the February 2022 Russian invasion of Ukraine reminded all Europeans how not cooperating with countries sharing the same values and principles was not a strategically sensible approach and even created unneces- sary risks for the concerned nations.