Successive governments have struggled to adequately fund defense, a challenge now amplified by a rapidly changing global security landscape and evolving nature of warfare. The United Kingdom faces increased state-on-state aggression, particularly from Russia and Iran, a shift from previous concerns about non-state actors.
Prime Minister Rishi Sunak acknowledged the volatile international climate, stating in a letter to ex-Defence Secretary John Healey that "The world today is more dangerous and uncertain than at any point in our lifetimes." This assessment underscores a broader strategic reevaluation.
The nature of warfare itself is transforming, with recent conflicts in Ukraine and the Gulf demonstrating a growing emphasis on drones, cyber capabilities, space technology, and the rapid mass production of adaptable weaponry. This contrasts with traditional, long-term investments in large, potentially vulnerable platforms.
Compounding these pressures, the United States has signaled a reduced willingness to subsidize the defense of its European allies, urging them to meet their NATO spending targets. In response to these mounting demands, the UK government has outlined increased defense investment plans. Last year, the UK spent 2.3% of its gross domestic product (GDP) on defense. The Labour party has stated this will rise to 2.5% by next year, with a further commitment to increase spending alongside other NATO allies to 3.5% of GDP by 2035. At a February security conference in Munich, the prime minister pledged, "We are going to have to spend more faster."
However, questions remain about the adequacy of these plans. John Healey has stated that the current defense investment plan is "well short of what is required." Decades of underinvestment following the Cold War led to a contraction of the army, navy, and air force. Furthermore, the Ministry of Defence has faced criticism for inefficient spending, with numerous procurement projects experiencing delays and cost overruns. Internal tensions between the Treasury and the Ministry of Defence have also historically hampered effective defense spending, with limited intervention from Downing Street or the Cabinet Office to resolve these disputes.