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1. Reducing the Role of Nuclear Weapons in Military Alliances

Author:
Tytti Erästö
Publication Date:
06-2024
Content Type:
Commentary and Analysis
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
This paper examines the role of nuclear weapons in military alliances, focusing on the perspectives of the so-called umbrella states—that is, allied states that do not have their own nuclear weapons but are part of the ‘extended nuclear deterrence arrangements’ of a nuclear-armed patron. After analysing allied security thinking and highlighting the underlying assumptions about nuclear deterrence, the paper subjects some of those assumptions to critical scrutiny. Taking into account regional military balances and escalation risks related to nuclear deterrence, it challenges the perceived security benefits of forward-deployed non-strategic weapons, continued support for allied nuclear doctrines based on readiness for the first use of nuclear weapons, and the assumed inevitability of nuclear second strike that underlies the practices of nuclear assurance. The goal is to open discussion on the development of a more measured approach to deterrence that would allow for minimizing the role of nuclear weapons in military alliances.
Topic:
Security, Nuclear Weapons, Alliance, and Deterrence
Political Geography:
Global Focus

2. The Role of Umbrella States in the Global Nuclear Order

Author:
Tytti Erästö
Publication Date:
06-2023
Content Type:
Commentary and Analysis
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
This paper focuses on countries under extended nuclear deterrence arrangements, or ‘umbrella’ states. The paper explores the ways in which umbrella states both in the Asia-Pacific region and in Europe have supported prevailing nuclear deterrence practices or distanced themselves from such practices. While there is a tendency for these countries to side with their nuclear-armed patron on matters related to nuclear weapons and nuclear disarmament norms, at times they have taken steps away from the allied mainstream position by advocating for anti-nuclear weapon policies. As long as extended deterrence has a nuclear dimension, allies will need to balance between normative pressures to support nuclear disarmament and alliance commitments that require at least passive support for nuclear deterrence practices.
Topic:
Arms Control and Proliferation, Nuclear Weapons, Treaties and Agreements, Alliance, and Deterrence
Political Geography:
Europe and Asia-Pacific

3. Revisiting ‘Minimal Nuclear Deterrence’: Laying the Ground for Multilateral Nuclear Disarmament

Author:
Tytti Erästö
Publication Date:
06-2022
Content Type:
Working Paper
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
The prospects for nuclear arms control appear dim following Russia’s invasion of Ukraine. Instead of continued reliance on nuclear deterrence, the resulting new awareness of nuclear risks should inform bold nuclear disarmament measures in the long term. Drawing on previous debates on ‘minimal nuclear deterrence’, this paper argues that nuclear deterrence is possible at low numbers, and hence reliance on nuclear deterrence is not an obstacle to significant progress in nuclear disarmament. In particular, there is scope for reducing the vast Russian and United States nuclear arsenals, which risk planetary-scale destruction and stand in the way of multilateral nuclear disarmament. At the same time, recent military-technological evolution has raised the bar for minimal nuclear deterrence by questioning the survivability of nuclear forces. In addition to making recommendations on how to address such strategic challenges, the paper addresses some conceptual dilemmas traditionally associated with minimal nuclear deterrence.
Topic:
Arms Control and Proliferation, Nuclear Weapons, Weapons of Mass Destruction, Disarmament, Multilateralism, and Deterrence
Political Geography:
Global Focus

4. New Technologies and Nuclear Disarmament: Outlining a Way Forward

Author:
Tytti Erästö
Publication Date:
05-2021
Content Type:
Special Report
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
This report sheds light on the impact of recent military-technological advancements on nuclear deterrence and disarmament. Noting that progress towards multilateral disarmament is hardly possible without prior and significant reductions in the largest nuclear weapon arsenals, the report views the resumption of bilateral arms control between Russia and the United States as the most important step towards disarmament at the present moment. It argues that these two countries should move away from their cold war era nuclear doctrines, which seek an ability to win nuclear wars, towards a policy of ‘minimal nuclear deterrence’, that is focused on deterring a nuclear attack. In line with doctrinal changes, further cuts in Russian and US nuclear stockpiles could be achieved by removing nuclear weapons from regional conflict dynamics, meaning that they would no longer serve as a deterrent against conventional aggression. Such a change would help to reduce nuclear risks without undermining regional deterrence, as each side already has robust conventional forces comprised of precision-strike weapons and other advanced military systems. At the same time, the report notes that progress towards nuclear disarmament would be complicated by long-range precision-strike weapons and strategic missile defences, which have raised the bar for credible nuclear deterrence by creating uncertainty about US adversaries’ second-strike capabilities. Lowering that bar and eventually reducing the perceived need for nuclear deterrence will require creative arms control diplomacy, including limits on strategic missile defences; stronger norms against both nuclear and conventional aggression; as well as a clear stigma against nuclear weapons.
Topic:
Arms Control and Proliferation, Nuclear Weapons, Science and Technology, and Disarmament
Political Geography:
Russia and United States of America

5. The Arms Control–Regional Security Nexus in the Middle East

Author:
Tytti Erästö
Publication Date:
04-2020
Content Type:
Working Paper
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
The erosion of the 2015 Iran nuclear agreement poses a risk for both Middle East regional security and the global nuclear non-proliferation regime. At the same time, it highlights the need to build a more sustainable regional foundation for conflict resolution and arms control in the Middle East. This paper argues that the arms control– regional security nexus should be better reflected in European policy. While maintaining the Joint Comprehensive Plan of Action (JCPOA) and preventing further US–Iranian escalation should be the European Union’s (EU) first priority, the paper urges the EU to develop a more comprehensive approach in support of regional security, arms control and disarmament in the Middle East. In addition to resolving inconsistencies in current EU policies on regional security, arms control and arms exports to the Middle East, the EU should consider throwing its political weight behind two emerging processes that could provide a much-needed opening for regional cooperation: security dialogue in the Gulf and the annual Middle East weapons of mass destruction (WMD)-free zone conferences at the United Nations. If it involved regional non-proliferation cooperation, the former process could also help manage the negative consequences of the potential collapse of the Iran nuclear agreement.
Topic:
Security, Arms Control and Proliferation, Nuclear Weapons, European Union, and Disarmament
Political Geography:
Europe, Iran, and Middle East

6. Towards Greater Nuclear Restraint: Raising the Threshold for Nuclear Weapon Use

Author:
Tytti Erästö
Publication Date:
05-2020
Content Type:
Special Report
Institution:
Stockholm International Peace Research Institute (SIPRI)
Abstract:
This report focuses on the risks that a lack of nuclear restraint pose for international security. On the one hand, the problem has to do with uncertainty regarding the first use of nuclear weapons, which has increased in recent years as a result of technological developments, political tensions, and the deadlock in nuclear arms control. On the other hand, there is a longer-term trend of a lowering nuclear threshold in response to WMD proliferation threats by non-nuclear weapon states. After identifying some of the most problematic aspects of the current nuclear policies of the five nuclear weapon states (NWS), the report makes the case for greater restraint, including recommendations for reducing doctrinal ambiguity and more credible assurances that the threshold for nuclear weapon use remains high. The report also seeks to provide conceptual tools for a broad international dialogue on nuclear doctrines, based on a recent agreement by the NWS to pursue such dialogue in the 1968 Treaty on the NonProliferation of Nuclear Weapons (Non-Proliferation Treaty, NPT) context.
Topic:
Arms Control and Proliferation, Nuclear Weapons, Treaties and Agreements, and Disarmament
Political Geography:
Global Focus