UK Ministry of Defence: Strategic Defence Review ()

Key Chapter Title List

1. Introduction and Overview
2. The Rationale for Transformation: Strategic Environment and Current State of Defense
3. Defining the Role of UK Defense
4. Transforming the UK's Way of Warfare
5. Allies and Partnerships
6. Homeland Defense and Resilience: A Whole-of-Society Approach
7. The Integrated Force: A Military Adapted for 21st Century Warfare
8. Defense Reform: Laying the Foundation for Success
9. Appendix: The Review Process

Document Introduction

This report presents the complete outcome of the UK government's first root-and-branch Strategic Defense and Security Review (SDSR) in 25 years since the end of the Cold War. Authorized by the UK Prime Minister in July 2024 and led by an external independent review panel—comprising former NATO Secretary General Lord Robertson, General Sir Richard Barrons, and Dr. Fiona Hill—the review was conducted over eleven months. It extensively consulted over 1,700 individuals and organizations, held nearly 50 high-level expert challenge panel sessions, and incorporated insights from citizen panel site visits, resulting in this transformative roadmap designed to address security challenges in the mid-to-late 21st century.

The core diagnosis of the report is that the UK is entering a new era of heightened threats and unprecedented uncertainty. Russia's full-scale invasion of Ukraine marks the return of interstate war in Europe, while the actions of China, Iran, North Korea, and others pose persistent challenges. Rapid and unpredictable technological change is reshaping the character of warfare. The report notes that while UK defense forces retain a global reputation and professionalism, their scale, readiness, and operational models remain deeply shaped by the post-Cold War demands of expeditionary and counter-terrorism operations. This has led to significant hollowing out, leaving them ill-prepared for the potential demands of high-intensity, protracted conflict against peer military powers.

Consequently, this assessment proposes a new vision for 2035: to forge the UK into a technology-enabled, leading defense power, possessing an integrated force that deters, fights, and wins through continuous innovation at wartime tempo. Achieving this vision relies on three fundamental shifts: First, integration by design, moving from joint to truly integrated operations, building an integrated combat force under the unified command of the Chief of the Defense Staff, supported by a common digital backbone and data, with lethality greater than the sum of its parts. Second, innovation-driven transformation, by forging new partnerships with industry, fundamentally reforming procurement processes, and establishing a dedicated UK Defense Innovation Organization to absorb commercial and dual-use technologies at wartime speed. Third, whole-of-society engagement, strengthening homeland defense and resilience by expanding the Cadet Forces, establishing new mechanisms for protecting Critical National Infrastructure, proposing a Defense Preparedness Act, and rebuilding national war readiness.

Regarding specific capability development, the report adheres to the core principle of NATO primacy, emphasizing that the UK must assume greater responsibility for Euro-Atlantic security. It systematically outlines transformation directions for capabilities across all domains: nuclear deterrence, maritime, land, air, space, cyber, and electromagnetic. This includes maintaining and modernizing the nuclear deterrent, creating a mixed Carrier Air Group, achieving a tenfold increase in Army lethality through a reconnaissance-strike model, developing the Future Combat Air System, enhancing space control and decision advantage, and establishing a Cyber and Electromagnetic Activities Command to unify operations in that domain. Simultaneously, the report establishes defense reform as critical to the success of the transformation, endorsing and reinforcing the deep organizational restructuring already initiated by the Ministry of Defense.

This document is not merely a policy statement but an action plan containing 62 specific recommendations with clear timelines and assigned responsibilities. It marks a fundamental shift in UK defense strategy—from a post-Cold War mindset based on expeditionary intervention and the peace dividend, to a new-era deterrence and defense paradigm centered on alliance primacy (NATO), integrated operations, technological innovation, and whole-of-society resilience.