Senior officials and military personnel from the UK and France met in London to advance nuclear cooperation under the Northwood Declaration, according to a statement issued by the UK government on 10 November 2026.

The Nuclear Steering Group, jointly chaired by the UK Cabinet Office and the Presidency of the French Republic, discussed progress in deepening coordination between the two countries' independent deterrents. It noted the importance of any adversary considering a threat to either nation's vital interests knowing they would face the combined strength of both forces. The group welcomed the UK's recent participation in France's airborne nuclear exercise, Operation Rummy, as a sign of increased operational alignment, and discussed France's "Forward Deterrence" initiative, which it said adds to European security and deterrence and further complicates the calculus of potential adversaries in addition to NATO.

Building on the 2010 Teutates Treaty and the UK-France joint testing facility EPURE, the group agreed to expand cooperation on technical capabilities and to begin reciprocal use of sovereign trials facilities in each country. It reaffirmed both countries' commitment to the international non-proliferation architecture and to continued engagement with other Nuclear Weapons States, particularly through the Non-Proliferation Treaty review cycle and the P5 Process, where France took over from the UK in September 2026.