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The 2026 US-Iran war has created a market where headlines move currencies by 0.5-1% within minutes. Ceasefire announcements pull USD/THB back toward 32; ceasefire breakdowns push it past 32.5. Two-week volatility cycles have been the norm since March. For Thai forex traders, this is the dominant feature of the market, not a backdrop to ignore.
What changes in a geopolitical crisis
Normal forex prices fundamentals slowly. Central bank meetings, employment data, inflation reports set medium-term direction. In a crisis, single headlines override fundamentals for days. A presidential statement on Iran moves the dollar more than the next CPI release. Trends become unreliable. Charts that look clean reverse in 30 minutes on news. Stop losses get hit at levels never normally traded. Spreads widen during news periods.
Currency pairs to focus on
The cleanest trades have been direct safe-haven flows. USD strength against emerging market currencies — including USD/THB — has been the most reliable directional bias. JPY strengthens on most risk-off events. Oil-sensitive currencies move aggressively: CAD strengthens on oil spikes, AUD weakens on risk-off as a commodity proxy.
Avoid exotic crosses that aren’t getting media attention. EUR/TRY, USD/RUB have wild moves but wide spreads and unpredictable gaps.
Position sizing for crisis volatility
Standard sizing fails in this environment. The 2% rule works in normal markets with 50-100 pip daily ranges on majors. In crisis markets, intraday ranges of 200-400 pips are common — a 50-pip stop has a meaningful chance of being hit by normal volatility before your thesis plays out.
Practical adjustment: reduce position size 50-70% from normal. If you’d normally risk 2%, risk 0.7-1%. Reduced sizing lets you place stops wider to survive intraday whipsaws while keeping account risk manageable.
News timing and execution
Major Iran headlines tend to break during US market hours (8 PM to 5 AM Bangkok). Asian session before US open is when Thai retail traders are most active but liquidity is thinnest. Holding leveraged positions overnight into potential headlines has been brutal in 2026.
Practical approach: smaller positions held longer with wider stops, or no overnight positions during high-tension periods. Active trading during London-NY overlap (9 PM to 1 AM Bangkok) when spreads tighten and execution is clean.
Reading headlines
Not every Iran story moves markets. Presidential statements on military action move USD strongly. Ceasefire announcements with specific terms (two-week truce) move USD strongly the other way. Vague diplomatic statements barely move price. Strait of Hormuz developments move oil first, then dollar through inflation expectations 30-60 minutes later.
Risk controls that matter
Mental stop-loss discipline. In a true crisis, retracements may not come for days. Get out at your predetermined stop even if it feels wrong.
Account-level stop. If your account drops 10-15% in a week, take a forced break for 48 hours. Re-entering with revenge trading psychology is how accounts get blown.
Withdrawal discipline. Take profits when you have them. Money left in the account is at risk if a single bad week takes you back to break-even.
