In a recent paper Jan Ruzicka and Nicholas J. Wheeler have posited that the Nuclear NonProliferation Treaty (NPT) is an example of several 'trusting relationships'. The authors assert that 'since the end of the 1990s the trusting relationships embodied in the NPT have come under strain' and that this accounts for the fact that the 'treaty is facing growing pressures that are eroding what has been an effective barrier to nuclear weapons proliferation'. This article questions the assumptions underlying this analysis. It argues that the approach taken by Ruzicka and Wheeler fundamentally misconceives the dynamics of nuclear non-proliferation. The policy implications generated by this approach are impractical and downright dangerous as they fail to address the causes of proliferation and instead exacerbate the problem further.The proliferation of nuclear weapons is widely perceived by political leaders as one of the major problems of global security in the contemporary era. This is clear from a litany of public pronouncements by US presidents, actions taken by the United Nations and declaratory policies of other states. For example, the commitment by the British coalition government in 2010 to the renewal of its strategic nuclear deterrent was based on the uncertain trajectory of nuclear proliferation, rather than present and certain risks (HM Government 2010a and 2010b). In recent years the academic expert community has renewed its efforts to unravel the causes of proliferation and understand the risks to the non-proliferation regime embodied in the nuclear non-proliferation treaty (NPT) and associated agreements.Broadly speaking, the factors that cause states to acquire or to forgo nuclear weapons are security, domestic politics, norms or psychological factors (Sagan 1996/97;Hymans 2006;Solingen 2007;Potter and Mukhatzhanova 2008). One of the key problems in developing a theoretical basis for the understanding of nuclear proliferation is the fact that it is actually very rare, and in each case the causal factors seem to differ significantly. One hundred and eighty-nine states are members of the NPT, including five nuclear states. There are only four states that are not members of the NPT and that have nuclear weapons. Of the four states that acquired nuclear weapons outside the NPT regime, the last one to make the decision to go nuclear and that received civilian nuclear assistance started its nuclear programme 38 years ago