Former NATO Secretary General Lord George Robertson has sparked renewed debate over the United Kingdom’s defence strategy and spending, questioning the current government’s approach to national security. Robertson, who authored the 2015 Strategic Defence Review (SDR), criticized what he described as Prime Minister Rishi Sunak’s complacency regarding Britain’s safety and called for a substantial increase in defence funding to address an alleged £28 billion shortfall.

Robertson’s position emphasizes maintaining Britain’s role as a close ally to the United States, arguing that the UK’s military should be structured to support American global leadership. This outlook aligns with recent procurement decisions, such as the acquisition of 12 U.S.-manufactured F-35A stealth jets capable of carrying nuclear weapons, which underscore the UK’s participation in NATO’s nuclear sharing arrangements rather than expanding an independent nuclear arsenal.

Critics caution that Robertson’s advocacy may presuppose the correctness of the current global defence posture without fully assessing its long-term viability. The model established under former Prime Minister Tony Blair, and affirmed in subsequent defence policy, prioritizes Britain’s position as the United States’ “principal partner” in international military operations, often described as a form of global policing reliant on alliance commitments. Historian David Edgerton has noted that only a fraction—between 15 and 20 percent—of UK defence spending directly addresses national defence, while the majority supports this broader transatlantic role.

This approach has drawn scrutiny amid recent geopolitical uncertainties, including Russia’s ongoing conflict in Ukraine, tensions in the Middle East, and the rise of China. Nevertheless, Whitehall assessments reportedly suggest that Britain does not face immediate, significant threats, prompting the government to stagger planned increases in military expenditure over the next decade rather than deliver immediate substantial rises.

Fiscal considerations also play a key role in the debate. The Treasury has expressed caution about prioritizing defence spending at the expense of social welfare and economic growth, especially given concerns that investment in defence yields limited economic stimulus compared with other public spending. Analysts such as Khem Rogaly from the Common Wealth think tank highlight that defence budgets may be less effective in job creation and broader economic benefits than alternative investments.

Further complicating the discussion are recent developments in U.S. foreign policy under President Donald Trump, whose administration has frequently exhibited skepticism toward longstanding international alliances and agreements. Trump’s threats concerning Greenland, apparent disregard for international law, and reversals on deals such as the Chagos Islands have heightened questions about the reliability of the transatlantic partnership at the core of Britain’s defence strategy.

In this context, voices calling for a reassessment of Britain’s defence commitments urge a clearer focus on national security interests and strategic autonomy. Robertson’s call for increased defence spending without revisiting these assumptions risks reinforcing a global posture viewed by some as overstretched and overly dependent on U.S. priorities. As the UK navigates its future security environment, balancing alliance obligations with domestic fiscal realities remains a central challenge for policymakers.