Prime Minister Keir Starmer lately boarded one of many UK’s 4 nuclear-armed submarines for a photograph name as a part of his makes an attempt to exhibit the UK’s defence capabilities as tensions with Russia proceed.
Nonetheless, 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 beneath the management of a completely transactional president, this isn’t perfect. The US can, if it chooses, successfully change off the UK’s nuclear deterrent.
British and US nuclear historical past is irrevocably interwoven. The US and UK cooperated on the Manhattan challenge, beneath 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 participating 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, nevertheless, 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 how one can counter the Russian menace grew to become the muse 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 at the moment are so entangled that it is rather laborious to depart the co-dependent relationship.
Each side have benefited from safety and safety, particularly through the chilly struggle. Nonetheless, Trump’s new “particular relationship” with Russia’s Vladimir Putin has reconfigured the worldwide order of geopolitics.
Serious concerns at the moment are being raised in regards to the UK’s nuclear capability, given the unpredictability and potential unreliability of the brand new US administration. Trump might 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.
Nonetheless, 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 different. The Trident system due to this fact depends on the US for assist and upkeep.

Alamy/PA/Danny Lawson
The UK is at present 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 supply 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, could be a costly and protracted exercise.
Technical collaboration with France appears probably the most believable back-up possibility in the meanwhile. The 2 international locations have already got a nuclear collaboration treaty in place. France has taken an identical submarine-based strategy to deterrence because the UK and French president Emmanuel Macron has steered its deterrent might be used to guard different European international locations. One other different could be to unfold the associated fee 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 might 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 contemplate different 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 funds by £7.9 billion over the following ten years. This funding might be channelled into extra urgent safety threats, corresponding to cybersecurity, terrorism or local weather change.
Nuclear weapons will turn out to be strategically redundant if the UK can not act independently. As Nato and the US dominate the worldwide nuclear stage, the UK’s capability to reply has turn out to be contested. The time has come to resolve whether or not the US is basically our good friend – or a brand new foe.