Britain and the US plan to extend indefinitely the treaty governing technology sharing between their nuclear weapons programmes, as both nations embark on costly modernisations of their deterrent to counter arms proliferation by adversaries.
The change — formally recommended by the UK and US governments but subject to legislative ratification by both sides — scraps the Mutual Defence Agreement’s previous 10-year limit and follows warnings by the UN that Russia’s war in Ukraine has sparked a global race for nuclear weapons.
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