French analysts – including this author – are keen to point out that there is an inherent contradiction between moving effectively towards abolition and maintaining, at the same time, a technically, operationally, and politically credible nuclear deterrent. In other words, it is by no means certain that you can have your cake and eat it – take concrete steps towards abolition and "maintain a safe, secure and effective arsenal to deter any adversary," as President Obama promised in Prague. London may soon find itself embroiled in this contradiction due to large expenses that will be needed to replace its Trident submarines.