UK Calls for Global AI Rules, Warning of 'Hiroshima'-Scale Risk

UK Foreign Secretary Yvette Cooper has called for binding international agreements to govern how AI is developed, saying in a Guardian exclusive published on 5 July 2026 that uncontrolled AI could pose a catastrophic threat comparable to nuclear weapons before the world found ways to manage them.

The warning came with a foreign policy essay released at the same time by Chatham House, a leading policy think tank. Cooper's main argument uses nuclear weapons as a comparison — and with reason. International rules on atomic weapons only came after Hiroshima showed what the technology could do. "We cannot afford to wait for an AI equivalent of Hiroshima before we act," she wrote. The choice of words matters. She frames AI governance as something the world needs to prevent, not something to manage after a disaster, and places it within international relations rather than technology regulation alone.

Cooper named the United States and China as the two countries whose agreement is essential. Here lies the real difficulty: these two nations lead the world in AI development but are also strategic rivals. Every attempt to control advanced technology — from limiting chip exports to managing supply chains — has become a competition between them. The UK, which does not lead in frontier AI (the cutting edge of the field), is positioning itself as a neutral convener rather than a main player, a role it has pursued since hosting the 2023 Bletchley Park AI Safety Summit.

She told the Guardian that she expects AI to dominate foreign policy discussions for the next two years — a timeline that would leave little room to design new institutions if that prediction proves correct.

Broader Changes to Foreign Policy

Cooper's essay addresses more than AI. She warned that climate change, migration pressures, and foreign interference campaigns destabilize Western democracies, yet no existing international body is set up to handle all these problems together.

On relations between Europe and the United States, Cooper's language is direct. She said European countries should stop assuming the US will continue its post-1945 role as a global defender of peace and democracy — and that this shift in thinking should hold even after the Trump presidency. This is a structural argument, not a personal one about current leaders, and it carries weight if European governments take it seriously.

Her suggestion for UK-EU relations builds on that premise. Instead of the gradual, negotiation-by-negotiation approach since Brexit, Cooper called for a permanent, negotiated partnership centered on what she called "a more European Nato at its core." European Nato refers to the idea of European countries within NATO taking on more of their own defense. The phrase signals interest in deeper European military cooperation as the foundation of a reset, more than trade deals or regulatory changes.

The Political Layer

The timing and where Cooper published her essay connect to UK domestic politics. Senior Labour figures are publicly positioning for roles in a likely future Andy Burnham cabinet, with David Miliband widely reported as a candidate for Cooper's current post as Foreign Secretary. Publishing a serious foreign policy statement through Chatham House — the venue where British strategic doctrine is typically announced — reads as an attempt to shape the terms of debate and leave a mark on policy independent of what comes next.

An EU-UK summit planned for later in July 2026 was postponed. EU officials chose to wait and engage directly with an incoming Burnham government rather than negotiate with an outgoing one. That delay has real consequences: any stronger UK-EU partnership that Cooper proposes will be built, if it happens at all, by her successor.

Context deepens the picture. Cooper and Japan's Foreign Minister Motegi held the Japan-UK Foreign Ministers' Strategic Dialogue in Tokyo in April 2026. That discussion touched on shared concerns in the Indo-Pacific region — the same area where AI and semiconductor competition is most intense.

What Cooper has delivered reads less as a practical plan and more as a statement of principles at a moment of political change. Whether the Burnham government will adopt her "Hiroshima" framing, push for the European security structure she describes, or pursue its own priorities remains an open question. By publishing the essay, she has placed these ideas on the record — and, perhaps more importantly, in the conversation for whoever follows her.