Extended deterrence, commonly known as the “nuclear umbrella,” represents America’s commitment to defend its allies against strategic threats, including the use of nuclear weapons. Since the late 1940s, this policy provides security guarantees to NATO members and Asian allies like Japan and South Korea.

Rising threats from adversaries like North Korea and Iran, coupled with the modernization of arsenals by Russia and China, underscore its continued necessity. Without this safeguard, allies may feel compelled to pursue independent nuclear programs, triggering preventable proliferation that can destabilize entire regions and weaken American influence.

Consider a scenario where the United States’ failure to build a peer theater nuclear capability and public statements are viewed by allies as a reduction in American nuclear commitments in East Asia. Japan, confronted by an assertive China and threatening North Korea, initiates a covert nuclear program, leveraging its advanced civilian nuclear technology and plutonium reserves. Constitutional constraints notwithstanding, mounting public anxiety could drive Tokyo toward its first nuclear test.

South Korea, facing similar security vulnerabilities, revives its previously dormant nuclear ambitions. Taiwan, under existential threat from China, sees nuclear capability as essential for survival. Alarmed by these developments, President Xi Jinping orders an accelerated attack on Taiwan and, potentially, attacks targets in South Korea and Japan to preempt support of Taiwan.

This ripple effect would yield devastating global repercussions. The Treaty on the Non-Proliferation of Nuclear Weapons (NPT), a cornerstone of nonproliferation, ceases in relevance. Nations such as Saudi Arabia, Turkey, Germany, and Poland might explore nuclear options. With more nuclear actors in play, risks increase as a statistical probability. Diplomatic and economic instability would likely surge, potentially fracturing alliances, crippling foreign investment, and destabilizing global markets.

Extended deterrence is not merely about preventing proliferation; it provides substantial military and economic benefits as well. American allies contribute robust defense capabilities, hosting critical strategic bases essential for American operations. South Korea’s military fought alongside American forces in every conflict since Vietnam, while Japan’s formidable naval and air capabilities enhance American strategic flexibility. European NATO allies provide indispensable missile defense and air operations infrastructure, reinforcing American global power projection.

Economically, the nuclear umbrella fosters stability, encouraging foreign direct investment from treaty allies like Japan, Germany, and South Korea—three of the top investors in the US. This security framework ensures mutual prosperity and deepens economic interdependence, strengthening not just trade partnerships but long-term strategic relationships. South Korea, the world’s 14th-largest economy, thrives under this arrangement, further reinforcing cross-border trade and investment.

Upholding extended deterrence demands a long-term investment of American resources, ensuring stability across NATO. Allied nations pledged to meet defense spending commitments, emphasizing the principle that collective security thrives on shared responsibility. Given that the US allocates just under three percent of its gross domestic product (GDP) to defense, committing at least two percent is a reasonable expectation.

Eleven nations met the two percent target in 2023, up from just four in 2017. President Trump’s pressure campaign on NATO defense spending is working. If every NATO nation adhered to the two percent minimum, the alliance’s total defense budget would rise by over $100 billion annually, reinforcing military capabilities, strengthening infrastructure, and fortifying global stability.

More than just a financial obligation, honoring these agreements is fundamental to sustaining NATO’s unity and trust. Increased investment not only bolsters collective security but also eases the strain on the US, which continues to shoulder the responsibility of protecting Western civilization from instability.

Extended deterrence long served as the backbone of global stability, shaping a world where security, military cooperation, economic prosperity, and nuclear nonproliferation are upheld. Stability is not self-sustaining; it demands vigilance, action, and unwavering commitment. NATO’s legacy proves this repeatedly. From coalition forces uniting in Kosovo to prevent ethnic cleansing, to NATO-led air campaigns in Libya that dismantled an oppressive regime, alliance members stood together in moments of crisis. Joint operations in Afghanistan, where NATO countries fought side by side for nearly two decades, showcased the strength of shared commitment. Even today, as NATO fortifies defenses in Eastern Europe, the principle remains unchanged. Security is only as strong as the unity behind it.

NATO’s Article 5 is more than a pledge; it is a promise that must be upheld through action. Security is not theoretical; it is built on resources, strategy, and cooperation. The deterrence piggy bank needs deposits, not just withdrawals. If allies fail to uphold their commitments, the burden on the US becomes untenable.

The stakes could not be higher. Geopolitical tensions are rising, nuclear threats are evolving, and adversaries are watching for cracks in the foundation. The American nuclear umbrella remains a pillar of international security, but it is only as strong as the resolve behind it. Allies must step up because if they do not, the rain will come, and they will find themselves unprotected in the storm.

Brandon Toliver, PhD, serves on the A4 staff of Headquarters Air Force. The views expressed are those of the author and do not reflect the official guidance or position of the United States government, the Department of Defense, the United States Air Force, or the United States Space Force.

The Nuclear Umbrella: Reassurance or Relic in a Shifting World? was originally published on Global Security Review.

Though integrated deterrence outlines a comprehensive strategy, the complexities of integrating diverse tools and actors across multiple domains can be incredibly challenging. Coordinating actions between military, diplomatic, economic, and informational agencies require seamless communication, shared goals, and a clear understanding of roles and responsibilities. Even then, it still may not work. It is arguable that the Russian invasion of Ukraine was the first example of integrated deterrence’s failure.

Prioritizing non-military tools within an integrated deterrence strategy can mitigate the risk of escalation and unintended conflict while providing proportionate responses to aggression, potentially avoiding the need for military force. Despite the application of various non-military measures, Russia was not dissuaded from its invasion, demonstrating the limitations of this approach in altering aggressive behavior when considering the impacts on Russia’s political influence, economic stability, and military capabilities. Economic sanctions against Russia over the past two years are proving an abject failure, as are diplomatic efforts to isolate Russia.

The effectiveness of an integrated deterrence strategy hinges on the same factor as previous and long-standing deterrence strategies—the ability to credibly threaten and, if necessary, impose meaningful costs on adversaries. This is difficult to achieve, especially when dealing with adversaries who are willing to tolerate economic pain, information warfare, or other non-kinetic actions.

At its core, integrated deterrence is designed to be flexible and adaptable, allowing the US to tailor its response to specific threats and adversaries. Theoretically, this can make it more effective than traditional deterrence, but there is little evidence to support the theory. In fact, integrated deterrence has been successful at extending the conflict between Ukraine and Russia and has utterly failed to restore deterrence with Russia. Russia’s nuclear threats have proven more successful in deterring American and European intervention on behalf of Ukraine.

The complexity of integrated deterrence leaves it prone to miscalculation and misinterpretation, as adversaries may perceive certain actions as escalatory or provocative. This can lead to unintended consequences and increase the risk of conflict, rather than supporting deterrence. Implementing integrated deterrence requires significant resources and investment across multiple domains. This can strain budgets and create competition for resources between different agencies and priorities.

Alliances, a crucial aspect of integrated deterrence, are important, but relying too heavily on them for deterrence can create vulnerabilities if allies are unwilling or unable to meaningfully contribute capability. This undermines the credibility of the overall deterrent effort. The shift to integrated deterrence as a preferred strategy for discouraging aggression against the interests and allies of the United States has seemingly positioned Russia and China in an advantageous position to seize a small window of opportunity to reshape the global power dynamic, while potentially creating the opportunity for states such as North Korea and Iran to extend their regional objectives beyond words.

Alternative strategies to integrated deterrence could focus on revitalizing traditional military capabilities while fostering deeper diplomatic ties with allies. Bolstering conventional forces and modernizing nuclear arsenals can serve as a powerful deterrent by signaling a nation’s willingness and ability to defend its interests. Simultaneously, strengthening alliances and partnerships through information sharing, joint military exercises, and technology cooperation can create a united front against potential adversaries.

This multifaceted approach, combining hard power with robust alliances, may prove more effective in deterring aggression than relying solely on economic or informational tools. Moreover, a renewed focus on arms control agreements could reduce the risk of miscalculation and escalation, contributing to a more stable security environment. Ultimately, a balanced strategy that leverages military might, diplomatic cooperation, and arms control measures could offer a more comprehensive and robust approach to deterring aggression in the 21st century.

Time will tell if the choice to apply a strategy of integrated deterrence convincingly reinforces the all too important “will” necessary for any effective deterrence strategy or it results in the United States grossly miscalculating its ability to deter with non-military and non-nuclear means. If the Biden administration is wrong, American interests around the world will suffer greatly.

Joshua Thibert is a Contributing Senior Analyst at the National Institute for Deterrence Studies (NIDS). With over 30 years of comprehensive expertise, his background encompasses roles as a former counterintelligence special agent within the Department of Defense and as a practitioner in compliance, security, and risk management in the private sector. The views expressed in this article are his own. 

American Legitimacy and Integrated Deterrence was originally published on Global Security Review.