Abstract NATO's involvement in Kosovo and its transformation from a military intervention to a UN-authorized peacekeeping operation has played a key role in the evolution of the alliance's strategic and political agenda. This article explores the importance of NATO's engagement with Kosovo in retrospect and in relation to the future outlook for European and global peace and security. It focuses on the centrality of this case for NATO's post-Cold War identity and as a key issue in the renewed political conflict associated with the transitional international order. We make three arguments. First, we argue that NATO's involvement in Kosovo has shaped and exacerbated the broader friction associated with the shifting international order. Second, we make the case that this engagement has played a key role in the strategic, political and operational development of NATO and its evolving identity. Thirdly, as a result of this, we argue that NATO's evolution and transformation in Kosovo was guided by what we call the logic of successful security practices. This entails making prudent political choices and implementing practical steps to harmonize divergent strategic interests among NATO members, adapting to shifting security circumstances, and upholding the organization's significance, credibility and influence both within and beyond the Euro-Atlantic community.