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US-UK Mutual Defence Agreement

The 1958 agreement between the US and the UK for mutual defense.

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Jan 22, 2026
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How do US-UK agreements (like the Polaris/Trident arrangements) shape costs and sovereignty for the British nuclear deterrent?

agreements — notably the (MDA) and the — make the British materially cheaper and technically feasible for while constraining full operational independence and exposing the UK to political leverage; th...

Jan 22, 2026

How have previous US support withdrawals (e.g., Polaris-era changes) affected allied ballistic missile programs and what lessons apply to Trident?

When shifted its industrial and programmatic focus away from Polaris-era systems, allied partners — most notably — faced gaps in sustainment, design input and parts supply that forced expensive, polit...