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The New START treaty between the United States and Russia formally expired in early February 2026, eliminating the last legal bilateral limits on the world’s two largest nuclear arsenals.
The 2010 agreement capped deployed strategic warheads at about 1,550 each and placed limits and verification measures on intercontinental delivery systems; those verification inspections were suspended in 2020 and Moscow froze participation in 2023.
In September 2025 President Vladimir Putin offered a voluntary one-year adherence to the caps, but Washington did not negotiate an extension.
Moscow has said it is “no longer bound” by the treaty limits while vowing to act “responsibly,” and Washington has reiterated that any future arrangement should include China, whose arsenal has expanded rapidly.
Both countries are undertaking major nuclear modernisation programmes and US officials have signalled a willingness to resume testing and develop new defensive systems.
Analysts and campaigners warn the treaty’s demise risks triggering a renewed arms race, undermining verification regimes and increasing proliferation pressures on other states and alliances.
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Euronews | Latest breaking news available as free video on demandSTART is over: US and Russia no longer have limits on nuclear arsenals
France 24 - International breaking news, top stories and headlinesRussia says it is ‘no longer bound’ by nuclear arms limits as treaty with US ends




















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