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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