This essay bases itself on a qualitative method and a case study analysis of seven objects of analysis, partly the nations who are identified as superpowers among nuclear weapons states, long term possessors of nuclear weapons, and new players. It also examines the historical and contemporary nature of national nuclear doctrine with the aim of conceptualising change and why they occur in doctrines, as well as testing these changes against theories of offensive and defensive neorealist assumptions on what drives states to act within the sphere of nuclear force. Three research questions guide the thesis, pertaining to why nuclear doctrines change, whether states in nuclear force seek equilibrium or security, as well as what kind of incentive ...