Much has changed since the National Security Strategy and Strategic Defence and Security Review (SDSR) was published in November of last year. The principal threats to our national security remain the same. We are witnessing the resurgence of state-based threats – as displayed most obviously by Russia’s actions in Syria and Ukraine; terrorism and extremism threaten our security; cyber attacks are on the increase from both state and non-state actors, and we face renewed challenges to the rules-based international order that provides the bedrock of our security 

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