The new National Security Strategy and Strategic Defence and Security Review (SDSR) published in November 2015 is intended to define the contours of the UK's ambitions for the next five years. As the debate continues over what this will mean in practice, Malcolm Chalmers analyses the ebb and flow of UK defence policy over the past two decades, and its ties to the country's economic fortunes and international aspirations, before assessing how the 2015 SDSR and the reforms and investments it envisages build on these foundations.
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