Britain’s 2025 Strategic Defence Review marks a profound shift from post-Cold War complacency to strategic realism. With increased defence spending, revived industrial capacity, nuclear modernization, and a global military posture, the UK is preparing for long-term global disorder. From missile stockpiles to cyber resilience and AI-driven warfare, the review signals that Britain is rearming not for the last war, but for a future of great-power rivalry and enduring geopolitical turbulence.