What if America turned off Britain's weapons?

Sovereignty, De Gaulle, and Strategic Autonomy

• Multiple commenters see the UK’s reliance on US-controlled systems as proof that it lacks full sovereignty; de Gaulle’s push for French strategic autonomy is praised as vindicated.
• Sovereignty is framed as a spectrum: even mid-sized powers can’t stand alone against true superpowers, but deep dependence still reduces autonomy.
• Some argue the dependence was a deliberate Cold War tradeoff that governments won’t admit plainly to their publics.

Trident, “Off Switches,” and Technical Leverage

• Debate over whether the US could or would “turn off” Britain’s Trident capability:
  • One side: backdoors/withholding parts are risky (could be found, exploited), and the effect would be gradual, not instant; UK could likely improvise over time.
  • Others quote officials saying that, over a few years without US support, the deterrent would face “great difficulty” and “scrambling” for spares.
• Similar concerns raised about F-35s: mission software, mission data files, and update channels are heavily US-controlled, creating effective veto power.
• Broader worry that any complex system needing code, maintenance, or parts from the US is a control vector.

GPS and Other Infrastructure Dependencies

• Some see GPS degradation or selective availability as a more realistic lever than nukes, especially for aviation and shipping.
• Others note SA was removed from newer satellites and was never a geo-specific “off switch,” plus the US also needs precise GPS and would hurt itself.

Nuclear Deterrence and Proliferation

• Arguments that fewer nuclear powers might be good run into counterexamples: Ukraine’s disarmament is cited as a cautionary tale; Russia’s nuclear shield is seen as enabling aggression.
• Several predict more states (including European ones) will pursue their own nukes if US guarantees are unreliable, weakening non‑proliferation.

European Military Capability and Industry

• Split views on whether Europe “has no choice” but dependence vs. could rearm quickly:
  • Skeptics point to decades of underinvestment, fragile economies, and lost industrial baselines (e.g., German nukes, subs).
  • Optimists say money can be printed; what matters is industrial capacity and political will, and European industry (e.g., Germany) is still formidable if mobilized.
• Discussion that US spending is largely about global power projection; a defensive European posture doesn’t need carriers and global bases.

US Kill Switch Scenarios and Cyber Vulnerability

• Some imagine extreme scenarios where US tech vendors push “poisoned updates,” cut cloud services, or disrupt communications to cripple Europe.
• Others see this as exaggerated but acknowledge it highlights digital and supply-chain dependence, not just weapons platforms.

Trump, MAGA, and the Western Alliance

• Many comments express that Trump’s current actions (e.g., on Ukraine) already constitute “strategic betrayals,” destroying trust built over 80 years.
• Europeans in the thread perceive US public indifference or hostility toward Europe; some Americans counter that many are “in mourning” but constrained by repression, economic precarity, and protest risks.
• One camp argues US institutions and the “deep state/military‑industrial complex” will limit any president’s ability to upend superpower strategy; Trump is seen as a short‑term aberration.
• Others respond that domestic authoritarian drift directly affects foreign policy and that assuming Trump is strictly time‑limited is unsafe.

Economic and Defense-Industrial Consequences

• Several note that if the US ever visibly “turns off” allied systems, it would devastate trust in US defense exports and tank contractors’ stock prices.
• Some already see US defense stocks hit by budget moves, with European defense firms rising on expectations of rearmament and indigenization.
• There’s skepticism that Washington would risk killing its own defense export market; others say recent US sanctions/financial actions (like SWIFT) show willingness to incur big collateral damage.

Shifting European Security Architecture

• Growing chorus that Europe must “break free” of US defense procurement: develop independent nukes/delivery systems or integrate more with French capabilities.
• Suggestions include:
  • Typhoon successors and other fighter programs without US components.
  • SAAB reconsidering US engines for Gripen.
  • Closer UK–France or broader EU cooperation on nuclear and conventional systems.
• Some foresee France, with nukes, energy exports, and a UN veto, becoming the de facto security core of Europe.

Long-Term Outlook and Risk

• Several commenters stress that relying on “waiting out” one US administration is reckless; once alliances and norms are broken, they are hard to restore.
• Consensus that more nukes and more fragmented security guarantees raise existential risks, but disagreement on whether this is now inevitable or still avoidable.