Britain and France will jointly develop the next generation of deep-strike and anti-ship missiles to replace the Storm Shadow.

UK Defence Journal 10-07-2025 https://ukdefencejournal.org.uk/

The UK and France are Europe’s only nuclear-armed powers and two of NATO’s three nuclear states, alongside the United States. Though both nations contribute separately to the alliance’s deterrent posture, this declaration goes further, raising the prospect of integrated decision-making in scenarios involving existential threats.

Defence Secretary John Healey said the new posture underlines shared resolve. “This partnership strengthens our leadership in Europe and sends a clear signal to our adversaries that we stand stronger, together,” he said.

The declaration is part of a broader update to the Lancaster House treaties, including a reinforced Combined Joint Force with cyber and space capabilities, and closer integration across strategic planning. Officials say it reflects a maturing of UK–France defence cooperation after years of joint deployments, industrial collaboration, and shared nuclear research.

By formalising coordination at the highest level of deterrence, London and Paris are aiming to deter adversaries through a united nuclear front, while also demonstrating European strategic autonomy within NATO’s framework.

_{George Allison}

_{George has a degree in Cyber Security from Glasgow Caledonian University and has a keen interest in naval and cyber security matters and has appeared on national radio and television to discuss current events. George is on Twitter at @geoallison}