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11. How can Europe’s nuclear deterrence trilemma be resolved?

Author:
Andrea Gilli and Francesco Nicoli
Publication Date:
06-2025
Content Type:
Working Paper
Institution:
Bruegel
Abstract:
The United States under President Donald Trump has adopted an ambiguous position on European security. Although no immediate risk of abandonment is apparent, European countries are rethinking their defence strategies in case the US declines to support them, or provides only partial support, in a crisis. This discussion is particularly sensitive in relation to nuclear weapons, the ultimate deterrent, for which European countries depend extensively on the United States. We argue that a possible future US withdrawal from European nuclear security will force European countries to face a policy trilemma. If they stick to the existing policy framework of no proliferation and no joint deterrence, they expose themselves to nuclear blackmail, should the US withdraw its external guarantee. If they want to protect themselves from nuclear blackmail, they must choose how to provide nuclear security: either collective nuclear security, which would compromise some national sovereignty, or independent provision by individual countries, leading to nuclear proliferation in Europe. Having established that uncontrolled proliferation is an inferior outcome to some form of joint deterrence, we identify four main alternatives: an extension of the Franco-British nuclear deterrent; an extension complemented by a jointly financed expansion of existing deterrence; the absorption of the French (and perhaps British) nuclear arsenals into a European arsenal; and the construction of a separate European submarine deterrent (with Europe using French or British technology or developing new technology). We also discuss briefly forms of non-nuclear deterrence, which however would likely be a complementary rather than a substitute for a nuclear deterrent. We compare these options using a set of parameters: strategic autonomy and credibility, changes to treaties (including non-proliferation), costs, capabilities and readiness. Our analysis shows that all options have advantages and disadvantages, but some are politically, financially and militarily more feasible.
Topic:
Security, Arms Control and Proliferation, Industrial Policy, Nuclear Weapons, Geopolitics, Macroeconomics, Deterrence, Transatlantic Relations, and Vulnerability
Political Geography:
Europe, North America, and United States of America

12. NATO’s Posture vis-a-vis Russia: Features and Challenges

Author:
Elio Calcagno and Alessandro Marrone
Publication Date:
02-2024
Content Type:
Commentary and Analysis
Institution:
Istituto Affari Internazionali
Abstract:
The Russian war against Ukraine has had multiple impacts on NATO’s deterrence and defence stance vis-à-vis Moscow, which today presents a number of challenges to allies – particularly European ones. The 2022 Madrid summit and the resulting Strategic Concept signalled a substantial departure for the alliance in terms of focus and posture.[1] First, the new Concept represents an unequivocal return to a Russia policy based first and foremost on deterrence and defence, rather than calls for cooperation that had been typical between the end of the Cold War and the Russian illegal annexation of Crimea in 2014.[2] The 2022 Concept stands in stark contrast with this period of détente and instead explicitly points to Russia as “the most significant and direct threat to Allies’ security and to peace and stability in the Euro-Atlantic area”.[3] This new focus on deterrence and defence is accompanied with an enhancement of NATO’s military presence along the northern and eastern flanks.[4]
Topic:
NATO, Deterrence, Defense Industry, and Russia-Ukraine War
Political Geography:
Russia, Europe, and Ukraine

13. Deterrence Gap: Avoiding War in the Taiwan Strait

Author:
Jared M. McKinney and Peter Harris
Publication Date:
01-2024
Content Type:
Book
Institution:
The Strategic Studies Institute of the U.S. Army War College
Abstract:
The likelihood China will attack Taiwan in the next decade is high and will continue to be so, unless Taipei and Washington take urgent steps to restore deterrence across the Taiwan Strait. This monograph introduces the concept of interlocking deterrents, explains why deterrents lose their potency with the passage of time, and provides concrete recommendations for how Taiwan, the United States, and other regional powers can develop multiple, interlocking deterrents that will ensure Taiwanese security in the short and longer terms. By joining deterrence theory with an empirical analysis of Taiwanese, Chinese, and US policies, the monograph provides US military and policy practitioners new insights into ways to deter the People’s Republic of China from invading Taiwan without relying exclusively on the threat of great-power war.
Topic:
Foreign Policy, International Security, Deterrence, and Cross-Strait Relations
Political Geography:
China, Taiwan, Asia, United States of America, and Indo-Pacific

14. The Future of Nuclear Proliferation after the War in Ukraine

Author:
Nicholas L. Miller
Publication Date:
04-2024
Content Type:
Working Paper
Institution:
Institut français des relations internationales (IFRI)
Abstract:
In the context of deep changes to the international security environment, especially the war in Ukraine, the risks of nuclear proliferation seem quite high, especially in the Middle East and East Asia. Four categories of factors have been identified that might trigger an escalation. Firstly, changes in the international security environment, including heightened competition among major powers, could increase pressure for proliferation in regions like Europe, Asia, and the Middle East. Secondly, the declining ability of the United States to enforce non-proliferation regimes may lead allies to seek nuclear capabilities due to concerns over U.S. reliability. Thirdly, failures by nuclear powers to uphold disarmament commitments and the emergence of the Treaty on the Prohibition of Nuclear Weapons could undermine non-proliferation norms. Lastly, the war in Ukraine highlights the potential use of nuclear threats in conflicts, reinforcing the perception of nuclear weapons as crucial for national security. While there are reasons to anticipate growing proliferation risks, historical precedent suggests that these risks can be managed. Concerns over U.S. reliability and disarmament failures have been addressed through coercion and reassurance in the past. Additionally, the impact of conventional wars supported by nuclear deterrence has been contained. While some risk factors are novel, such as the decline of the U.S. nuclear industry and the emergence of the Treaty on the Prohibition of Nuclear Weapons, their decisive impact remains uncertain. The implications for the Middle East and East Asia vary. Allies like Japan and South Korea may be convinced to remain non-nuclear due to U.S. security assurances, while adversaries like Iran could be incentivized to pursue nuclear capabilities amid declining effectiveness of U.S. sanctions. If Iran acquires nuclear weapons, it may pressure Saudi Arabia to follow suit, potentially leading to regional proliferation dynamics. Thus, great powers and the international community need to step in to manage proliferation triggers by maintaining a focus on nonproliferation in their statecraft.
Topic:
Arms Control and Proliferation, Nuclear Weapons, International Security, Deterrence, and Russia-Ukraine War
Political Geography:
Russia, South Korea, Saudi Arabia, and United States of America

15. Migrant Death and Disappearability at Sea: Mediterranean Necropolitics as a European Strategy of Migration Deterrence

Author:
Bertille Motte
Publication Date:
04-2024
Content Type:
Journal Article
Journal:
Journal of Public and International Affairs (JPIA)
Institution:
School of Public and International Affairs (SPIA), Princeton University
Abstract:
The Mediterranean Sea has become the deadliest passage in the world over the past decade, as thousands of migrants lose their lives at sea each year. It has become a key actant of European border violence perpetrated against migrants, as European national and supranational migration institutions instrumentalize the Mediterranean’s natural properties through necropolitical strategies of deterrence. The sea must be understood as a wet ontology and a fluid hybrid border. It is shaped by dynamic and complex interactions between human actors and more-than-human elements through which European violence is passed onto non-European migrants’ bodies. It conceals migrants’ deaths and disappearances, as they become ‘inevitable accidents’ caused by natural and untamable elements. The Mediterranean Sea therefore invisibilizes European structural violence occurring at the border zone and acts as an archive and witness to this violence.
Topic:
Migration, Border Control, Refugees, Violence, Deterrence, Asylum, Necropolitics, and Refugee Policy
Political Geography:
Europe and Mediterranean

16. Radicalization and Regional Instability: Effects of the Gaza War

Author:
Mamoun Fandy
Publication Date:
01-2024
Content Type:
Journal Article
Journal:
Cairo Review of Global Affairs
Institution:
School of Global Affairs and Public Policy, American University in Cairo
Abstract:
As Israel attempts to reestablish its identity as a regional deterrent by destroying Gaza, the effects of its campaign cascade through the region, shifting political alignments, and generating new concerns over radicalization and conflict spillover
Topic:
Radicalization, Deterrence, Instability, and 2023 Gaza War
Political Geography:
Middle East, Israel, Palestine, and Gaza

17. Japanese Economic Security as “Derisking”

Author:
Kazuto Suzuki
Publication Date:
01-2024
Content Type:
Working Paper
Institution:
Korea Economic Institute of America (KEI)
Abstract:
This paper examines the concept of “derisking” and how the Japanese Economic Security Promotion Act (ESPA) has responded to it within the framework of deterrence theory. It explores how ESPA allows deterrence by denial against economic coercion by other states and is itself a derisking measure. It contends that deterrence by denial, which means reducing dependency and improving resilience, could include stockpiling strategic materials, diversifying sources of supply, developing alternative materials, and developing alternative products. However, this paper argues that there is a need to strengthen the mechanism for collaborative deterrence by denial, such as the “Coordination Platform” presented at the G7 Hiroshima Summit. As for other forms of deterrence, such as institutional deterrence and deterrence by punishment, their effectiveness is insufficient, and they face many implementation problems. Therefore, this paper argues that the most optimal derisking strategy at this point is the combination of ESPA and the “Coordination Platform” to strengthen the capabilities of deterrence by denial.
Topic:
Risk, Deterrence, Economic Security, and Coercion
Political Geography:
Japan and Asia

18. Requirements for nuclear deterrence and arms control in a two-nuclear-peer environment

Author:
Gregory Weaver and Amy Woolf
Publication Date:
02-2024
Content Type:
Special Report
Institution:
Atlantic Council
Abstract:
After decades of seeking to reduce the role of nuclear weapons in international relations, the United States is now grappling with a global landscape marked by intense strategic competition and the growing salience of nuclear weapons—problems that will likely persist for years to come. Over the past year, Russia compounded its aggression in Ukraine with nuclear saber-rattling, modernizing and expanding its nuclear forces over the past decade. Furthermore, Russia’s possession of a substantial inventory of theater nuclear weapons continues to threaten regional deterrence. Meanwhile, in Asia, Beijing is pursuing an unprecedented surge in its nuclear capabilities. If current trends persist, China is projected to possess about 1,500 nuclear warheads by 2035.1 While China was once viewed as a secondary nuclear power, its substantial investment in its nuclear arsenal—including the launch of a third ballistic missile early-warning satellite in 2022 and advancements in land-based ballistic missiles, aircraft, submarines, and hypersonic missiles—positions China to become a near-equal nuclear power in the coming decade. These trends mark a historic shift. For the first time in its history, the United States must face two near-peer nuclear competitors simultaneously. At the same time, Russia’s suspension of its compliance with the New START agreement in 2023 has significantly weakened the last strategic arms control framework established in the Cold War and post-Cold War eras. This move leaves scant provisions governing the future of nuclear capabilities among the United States and its adversaries. For over half a century, Washington and Moscow negotiated to establish treaties that imposed limits on their nuclear arsenals, aiming to manage their nuclear rivalry and mitigate the risk of nuclear conflict. This process served the national security interests of both sides by curbing weapons and activities that could jeopardize deterrence, safeguarding strategic stability, offering insights into nuclear capacities, and potentially steering military competition toward less perilous avenues. However, shifts in the global security landscape have altered this calculus. The Russian Federation, much like the Soviet Union before it, has insisted that future agreements factor in the nuclear capabilities of Britain and France. On the other hand, the United States now confronts a security environment featuring two nuclear-armed adversaries—Russia and China—whose forces will potentially pose significant threats to the United States and its allies. This evolving security landscape may prompt the United States to reevaluate its assessments of its deterrence and arms control requirements. But how should the United States approach this problem?
Topic:
Defense Policy, Arms Control and Proliferation, National Security, Nuclear Weapons, Science and Technology, and Deterrence
Political Geography:
Russia, China, Asia, Korea, and United States of America

19. Deterring at a distance: The strategic logic of AUKUS

Author:
Luke Gosling
Publication Date:
06-2024
Content Type:
Commentary and Analysis
Institution:
Lowy Institute for International Policy
Abstract:
As China’s massive military build-up drives rising regional security anxieties, Australia is contributing to a more favourable balance of power through AUKUS. This technology-sharing agreement with the United Kingdom and the United States will see eight nuclear-powered submarines (SSNs) in Australian service by the 2050s. SSNs are overwhelmingly in Australia’s interest because they strengthen the country’s ability to deter war by threatening painful consequences for aggression against Australia, its partners, and its interests. The 2023 Defence Strategic Review explicitly tasks the Australian Defence Force with a deterrence role against a significant military power — a relatively new mission. SSNs are optimal deterrence machines, able to accomplish the essential tasks laid out in the Review.
Topic:
Defense Policy, Deterrence, AUKUS, Regional Security, and Nuclear-Powered Submarines (SSNs)
Political Geography:
Australia/Pacific

20. Tailored Deterrence Strategy on the Korean Peninsula

Author:
Gary Samore
Publication Date:
07-2024
Content Type:
Commentary and Analysis
Institution:
East Asia Institute (EAI)
Abstract:
Over the last decade, the most significant change in the international strategic environment has been the reemergence of a great power rivalry between the U.S. and its European and Asian allies on one hand and Russia and China on the other. This trend began in the second term of President Obama, with the Russian invasion of Crimea in early 2014 and the Chinese construction of a network of military bases in the South China Sea beginning around 2013. Since then, the trend has sharpened. The Russian invasion of Ukraine in February 2022 has locked the U.S. and its North Atlantic Treaty Organization (NATO) allies against Russia in a long-term struggle for the survival of Ukraine and future of European security. In Asia, tensions between Beijing and Washington have become worse, as both the Trump and Biden admіnistrations pursued economic measures against China, and as China appears to be building military options to unify Taiwan and the mainland by force. The reemergence of great power rivalry has important nuclear dimensions, increasing concerns about “strategic stability” – the nuclear balance among the great powers – and the risk of nuclear conflict. The Ukraine war has lowered the nuclear threshold. Russia has deployed tactical nuclear weapons in Belarus and threatened to use tactical nuclear weapons to discourage NATO intervention or assistance to Ukraine. The New Strategic Arms Reduction Treaty (New START) - the last remaining arms control treaty limiting U.S. and Russian nuclear arsenals - expires in February 2026, and Russia has refused U.S. offers to negotiate a new treaty as long as the U.S. is assisting Ukraine. In the meantime, Russia continues to develop an array of exotic nuclear delivery systеms intended to overcome U.S. missile defenses, including hypersonic reentry vehicles, nuclear-armed submarine drones, and nuclear anti-satellite weapons. China is pursuing an unprecedented nuclear build-up, including new strategic bombers, more advanced nuclear-armed submarines, and three new missile bases with more than 300 silos for solid fuel ICBMs with multiple reentry vehicles. According to U.S. Department of Defense estimates, China has more than 500 operational nuclear warheads as of May 2023 and will “probably have over 1,000 operational nuclear warheads by 2030” (U.S. Department of Defense 2023a). Like Russia, China is also pursuing hypersonic reentry vehicles, anti-satellite weapons, and strategic cyber operations. Some analysts fear that China’s nuclear build-up will make it more confident that it can deter U.S. intervention in the face of a Chinese invasion of Taiwan or increase the risk that a U.S.-China confrontation over Taiwan will escalate to nuclear use. To address the reemergence of great power threats, the U.S. has introduced the concepts of “tailored deterrence” and “integrated deterrence” into its nuclear doctrine. According to the Trump admіnistration Nuclear Posture Review, released in February 2018, The United States will apply a tailored and flexible approach to effectively deter across a spectrum of adversaries, threats, and contexts. Tailored deterrence strategies communicate to different potential adversaries that their aggression would carry unacceptable risks and intolerable costs according to their particular calculations of risk and cost (Office of the Secretary of Defense 2018). The tailored deterrence concept was also adopted by the Biden admіnistration in its October 2022 Nuclear Posture Review, saying, Central to U.S. deterrence strategy is the credibility of our nuclear forces to hold at risk what adversary leadership values most. Effectively deterring – and restoring deterrence if necessary – requires tailored strategies for potential adversaries that reflect our best understanding of their decision-making and perceptions (Office of the Secretary of Defense 2022). Building on the concept of tailored deterrence, the Biden admіnistration Nuclear Posture Review (NPR) also introduced the concept of “integrated deterrence,” which is based on the idea that traditional nuclear deterrence can be reinforced by non-nuclear capabilities. According to the NPR, The role of nuclear weapons is well established and embedded in strategic deterrence policy and plans. Non-nuclear capabilities may be able to complement nuclear forces in strategic deterrence plans and operations in ways that are suited to their attributes and consistent with policy on how they are to be employed. A pragmatic approach to integrated deterrence will seek to determine how the Joint Force can combine nuclear and non-nuclear capabilities in complementary ways that leverage the unique attributes of a multi-domain set of forces to enable a range of deterrence options backstopped by a credible nuclear deterrent (Ibid.).
Topic:
Foreign Policy, National Security, Nuclear Weapons, Deterrence, and Rivalry
Political Geography:
Asia, South Korea, North Korea, and United States of America