Prime Minister Keir Starmer not too long ago boarded one of many UK’s 4 nuclear-armed submarines for a photograph name as a part of his makes an attempt to show the UK’s defence capabilities as tensions with Russia proceed.
Nevertheless, Starmer faces an issue. The submarine, and the remainder of the UK’s nuclear fleet, is closely reliant on the US as an working accomplice. And at a time when the US turns into an more and more unreliable accomplice below the management of a wholly transactional president, this isn’t ideally suited. The US can, if it chooses, successfully swap off the UK’s nuclear deterrent.
British and US nuclear historical past is irrevocably interwoven. The US and UK cooperated on the Manhattan undertaking, below the 1943 Quebec agreements and the 1944 Hyde Park aide memoire. This work generated the world’s first nuclear weapons, which had been deployed on Hiroshima and Nagasaki in 1945.
It additionally led to the primary rupture. In 1946, the US categorised UK residents as “international” and prevented them from partaking in secret nuclear work. Collaboration with the UK instantly ceased.
The UK determined to develop its personal arsenal of nuclear weapons. The profitable detonation of the “Grapple Y” hydrogen bomb in April 1958 cemented its place as a thermonuclear energy.
EPA/Yuri Gripas
Within the meantime, nonetheless, Russia’s launch of the Sputnik satellite tv for pc in 1957 had demonstrated the deadly attain of Soviet nuclear know-how. This introduced the US and UK again collectively as nuclear companions.

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Talks on tips on how to counter the Russian menace grew to become the inspiration of an atomic partnership that endures to the current day. This mutual defence agreement, signed in 1958, has offered the UK with inexpensive entry to the most recent nuclear know-how and a dependable western ally. The treaty has been amended and tailored over time to mirror adjustments within the US-UK working relationship and the 2 are actually so entangled that it is rather onerous to depart the co-dependent relationship.
Either side have benefited from safety and safety, particularly in the course of the chilly conflict. Nevertheless, Trump’s new “particular relationship” with Russia’s Vladimir Putin has reconfigured the worldwide order of geopolitics.
Serious concerns are actually being raised concerning the UK’s nuclear capability, given the unpredictability and potential unreliability of the brand new US administration. Trump may ignore or threaten to terminate the settlement in a present of energy or contempt.
The UK’s nuclear subs
The UK’s Trident nuclear deterrence programme consists of 4 Vanguard nuclear-powered and armed submarines. The UK has some autonomy, as it’s operationally impartial and controls the choice to launch.
Nevertheless, it stays depending on the US as a result of the nuclear applied sciences on the coronary heart of the Trident system are US designed and leased by Lockheed Martin – and there’s no appropriate various. The Trident system subsequently depends on the US for help and upkeep.

Alamy/PA/Danny Lawson
The UK is at the moment within the means of upgrading the present system. However its choices appear restricted. If the US had been to renege on its commitments, the UK would both have to provide its personal weapons domestically, collaborate with France or Europe or disarm. Every state of affairs creates new points for the UK. Manufacturing nuclear weapons from scratch within the UK, for instance, can be a costly and protracted exercise.
Technical collaboration with France appears essentially the most believable back-up possibility in the mean time. The 2 nations have already got a nuclear collaboration treaty in place. France has taken an analogous submarine-based method to deterrence because the UK and French president Emmanuel Macron has urged its deterrent might be used to guard different European nations. One other various can be to unfold the price throughout Europe and create a European deterrence – however each methods simply re-embed the UK’s present nuclear reliance.

Number 10/Flickr, CC BY-NC-ND
Whereas these weapons could deter a hostile nuclear strike, they’ve failed to forestall broader acts of aggression. Nuclear weapons haven’t been utilized in warfare for 80 years. Maybe it’s time to fully and completely unshackle the UK from nuclear deterrence, and think about various types of defence.
The UK’s nuclear arsenal is expensive to take care of. The price of changing Trident is £205 billion. In 2023, the Ministry of Defence reported that the anticipated prices for supporting the nuclear deterrent would exceed its price range by £7.9 billion over the following ten years. This funding might be channelled into extra urgent safety threats, reminiscent of cybersecurity, terrorism or local weather change.
Nuclear weapons will change into strategically redundant if the UK can’t act independently. As Nato and the US dominate the worldwide nuclear stage, the UK’s capability to reply has change into contested. The time has come to resolve whether or not the US is absolutely our buddy – or a brand new foe.