The conventional arms control architecture in Europe is falling apart. This article argues that classic arms control theory fails to explain this continuing process. I suggest that its underlying stability paradigm, based on reciprocity and technical measures for war prevention, has forestalled a full understanding of actual arms control practices, particularly in Europe. In this context, I illustrate that conventional arms control has evolved in three historical stages. In each of these, state actors pursued different ideal-type purposes depending on the concrete geostrategic situation: the pursuit of politico-military advantages, the formal creation of crisis stability, and the transformation of international relations. In the last decade, the overall political focus has shifted once again to the first factor. Amidst new strategic competition, states are increasingly unwilling to agree to arms control regulations and transparency measures, as these could yield advantages to adversaries.