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1. 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

2. Challenges to NATO's Nuclear Strategy

Author:
Andrea Gilli
Publication Date:
12-2021
Content Type:
Research Paper
Institution:
NATO Defense College
Abstract:
In 2022, NATO will present its new Strategic Concept. Since 2010, when the previous Strategic Concept was published, NATO and the world have changed significantly. At the time, NATO was primarily engaged in crisis management, including in operations in Iraq and Afghanistan. The Strategic Concept enabled the Alliance to further expand – conceptually and geographically – its out-of-area activities, together with the core tasks of cooperative security. Eleven years later, the dominant paradigm of international politics is great power competition: in other words, countries like Russia and China are competing with the West strategically, economically, militarily, and in terms of values. Many things have remained constant, however: one is the centrality of nuclear weapons for NATO’s deterrence and defence posture. Since 2010, Allies have continued to affirm that as long as nuclear weapons exist, NATO will remain a nuclear alliance, notwithstanding the Alliance’s ultimate goal of a world free of nuclear weapons.
Topic:
Security, Defense Policy, NATO, Arms Control and Proliferation, Nuclear Weapons, Military Strategy, and Deterrence
Political Geography:
Europe and North America

3. Drones for Europe

Author:
Andrea Gilli
Publication Date:
09-2013
Content Type:
Policy Brief
Institution:
European Union Institute for Security Studies
Abstract:
The emergence of unmanned vehicles has dramatically reshaped intelligence and warfare over the past two decades. This is particularly clear in the air domain where the so-called drones have come to prominence as major force multipliers: at relatively affordable costs, they can deliver powerful surveillance capabilities, thus enhancing military planners' and political decision-makers' situation awareness and intelligence, as well as reducing troops' presence on the ground for both combat and non-combat missions. Moreover, over the next few decades, combat drones will reshape – if not completely revolutionise – air warfare thanks to superior aerodynamic, ground-attack and swarming capabilities, whatever one may think about their ethical implications.
Topic:
Arms Control and Proliferation, Intelligence, Science and Technology, and War
Political Geography:
Europe