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[email protected] National Security Strategy and Strategic Defence and Security Review 2015: Third Annual Report 3 Foreword by the Prime Minister, The Rt. Hon Theresa May MP. Over the last year, the challenges our nation faces have continued to evolve. They have become more complex, driven by technology and increasing competition between states. They have required greater collaboration to form an effective deterrent. The UK has responded to these challenges, building on the commitments we made in the Strategic Defence and Security Review 2015 and the National Security Capability Review 2018. We have begun to realise the benefits of the new Fusion approach in dealing with national security threats. We are able to harness the full impact of our national capabilities, increasing our ability to respond at speed, improving coordination of our activity, both across Government and with partners.