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Hiroshima for Global Peace

Research Project on Security Without Reliance on Nuclear Deterrence

For a world without nuclear weapons, HOPe looks beyond nuclear deterrence and seeks security without reliance on nuclear weapons. In the complicated world of multi-polarization, unstable regional affairs, and advanced and emerging technologyies, security system and arrangements are transforming. Working together with domestic and international experts, HOPe rethinks nuclear deterrence and envision what security without reliance on nuclear weapons look like in global and regional perspectives.

Reports and Papers


Reports will be published after April 2024.


Stockholm International Peace Research Institute (SIPRI)

The Role of Umbrella States in the Global Nuclear Order

Author: Dr Tytti Erästö


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.

Event Recordings

G7 Hiroshima Summit Related Event “Rethinking Nuclear Deterrence” (April 28, 2023)

Event report 

NPT PrepCom 2023 Side Event “Looking Beyond Nuclear Deterrence” (August 02, 2023)


Research Project on Nuclear Disarmament

From 2016 to 2021, HOPe and Hiroshima  pursued concrete measures or approaches for nuclear disarmament, comissioning international research institutes including  United Nations Institute for Disarmament Research (UNIDIR), the Stockholm International Peace Research Institute (SIPRI), the Royal Institute of International Affairs (Chatham House), and the UK University of Leicester.  

Visit commissioned reports

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