The US's weakened role as a security guarantor for Europe, exacerbated by Trump's skepticism of NATO and alignment with Russia, poses significant challenges for European nuclear deterrence. Experts suggest that Europe must develop a credible deterrent independent of US support, with France and the UK playing crucial roles. The UK's Trident program faces logistical and political challenges, while France's deterrent is seen as more independent. The future of European security arrangements remains uncertain, especially with rising threats from Russia and China.