Why wars are bad news for the 'special relationship'

UK Prime Minister Keir Starmer is facing a sustained diplomatic strain with US President Donald Trump over military cooperation and the use of Diego Garcia, defending continued intelligence-sharing and joint operations (US planes operating from British bases; UK jets intercepting drones/missiles) while insisting any UK action on Iran have a lawful basis and a viable plan. The piece situates the current rift in a historical pattern—Suez, Vietnam, Grenada, Iraq—underscoring elevated geopolitical risk and policy uncertainty that could widen risk premia and affect assets sensitive to Anglo‑US defense coordination and geopolitical shocks.

Analysis

Market structure: Geopolitical friction between the UK and US elevates demand for defense, intelligence services, and energy security products while pressuring travel, tourism and UK-centric consumer sectors. Expect a near-term 5–15% bid in large-cap defense primes (Lockheed NOC/LMT/RTX; BAE.L in UK) as emergency orders and spares are prioritized, with margin upside from supply constraints in electronics/missiles.

Risk assessment: Tail risks include a wider Middle East escalation (low probability, high impact) that could push Brent +$20–30/bbl and US 10y yields lower on safe-haven flows; immediate volatility will last days, elevated risk premia for weeks–months, and permanent defence budget uplifts over quarters–years if policy hardens. Hidden dependencies: UK-US procurement alignment, basing rights (Diego Garcia) and intelligence-sharing continuity are binary catalysts that can flip pricing power quickly.

Trade implications: Buy defense and energy vs short travel/leisure and GBP; volatility-sensitive plays (3–6m call spreads on LMT/RTX and 3m Brent call options) capture asymmetric upside while capping premium. Cross-asset: expect GBP weakness vs USD (0.5–3% range), stronger gold (GLD) as a 1–3% portfolio hedge and wider corporate bond spreads in UK financials if political friction deepens.

Contrarian view: The market may be overpricing a permanent UK-US rupture; historical parallels (Suez, post-Iraq) show relationships re-normalize within 6–18 months, which would unwind defense rallies by 15–30%. Trade with size discipline: scale into positions over 2–6 weeks, take profits on 15–25% moves and use 8–12% stops to avoid mean-reversion losses.

Key Decisions for Investors

• Establish a 2–3% NAV long in US defense primes split equally between LMT and NOC with a 3–6 month horizon; implement cost-control by buying 3-month 5% OTM call spreads (buy 1.5% OTM, sell 6.5% OTM) sized to equal 2% NAV, target +15–25% upside, stop-loss at -10%.
• Add 1–2% NAV long in energy majors (XOM or CVX) and a 1% allocation to Brent call options (3–6 month, strike ~10% OTM) to capture a potential >$10/bbl shock; trim travel/leisure exposure (reduce IAG.L and EZJ.L positions by 30%) within 10 trading days.
• Deploy a 1–2% NAV short GBPUSD (via forwards or FX spot) as an asymmetric hedge against UK political strain; size to risk a 1% adverse move (stop at +1%) and take profit if GBP falls 1.5–3% within 3 months.
• Allocate 1% NAV to GLD or physical gold as a tail-risk hedge; increase to 2–3% if Brent rises >10% in 14 days or if US 10y yield drops >25bps from current levels.
• Pair trade: Long RTX (1% NAV) vs short AAL (1% NAV) for 3–6 months — take advantage of defense upside versus airline demand hit; close pair if defense names underperform the S&P by >10% or airline spreads tighten by >150bps.