Countdown Risk Lifts the Dollar as Oil Drives FX

Trump's Iran ultimatum drives oil past $112 and yields to 8-month highs, redrawing the FX map. Geopolitics meets inflation. Sterling, the euro and the yen absorb the shock as the dollar takes the bid.

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GBP: Sterling Buckles Under the Clock

GBPUSD 1.3295 | EURGBP 0.8670

Sterling fell to $1.3295 as President Trump issued a 48-hour ultimatum to Iran. This approach, similar to reality TV diplomacy, sent shockwaves through the early sessions. The Monday 7:45 p.m. EDT deadline cast a shadow over Asian trade.

The threat to Iranian power plants and the potential closure of the Strait of Hormuz create a dual-threat environment. Geopolitical risk usually triggers a flight to quality. This rarely favours the pound. Gilt yields climbed with US Treasuries as a global bond selloff pushed 10-year US yields to eight-month highs of 4.415%.

The Bank of England (BoE) held bank rates last week, as expected. What arrived without much warning was the speed of the energy-driven inflation repricing, now doing Threadneedle Street's tightening for it. Traders now price 85 basis points of BoE hikes, a sharp reversal from recent rate cut expectations. Higher energy costs feed straight into UK inflation. A central bank already threading the needle between sluggish growth and stubborn prices finds that needle getting harder to thread.

EURGBP held at 0.8670. The cross reflects two economies absorbing the same energy shock, though from slightly different fiscal positions. The BoE's hawkish repricing gives sterling some support against the euro, even as both currencies still lose ground to the dollar.

Sterling watchers are now focused on whether gilt yields keep tracking US Treasuries and how the BoE’s next message will shape rate expectations.

Key technical levels for GBP/USD: Resistance at 1.3350, 1.3420 and Support at 1.3250, 1.3180

Key technical levels for EUR/GBP: Resistance at 0.8720 and Support at 0.8620

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EUR: The Energy Deficit Drag

EURGBP 0.8670 | EURUSD 1.1539

The euro slid to 1.1539 against the dollar as the market penalised economies sensitive to energy supply shocks. Brent Crude’s choppy climb toward $113 a barrel weighs heavily on the Eurozone’s trade balance.

Currencies like the euro and the yen struggle when energy prices soar, as these regions are net energy importers. While the European Central Bank (ECB) kept rates on hold last Thursday, its warning regarding energy-driven inflation did little to support the currency.

Policy divergence is widening; the market now prices in a 75-basis-point ECB hike, yet the euro fails to gain traction against a greenback backed by domestic energy independence. The ECB is likely to hike rates not because growth is strong, but because oil is forcing its hand. Rising rates against a weakening growth backdrop is the combination traders recognise as stagflationary pressure.

Another economist noted: economies suffering a negative energy supply shock are likely to underperform those benefiting from a positive one. The eurozone sits firmly in the first group. International Energy Agency (IEA) chief Fatih Birol, speaking in Australia, described the current crisis as more severe than the 1973 and 1979 oil shocks combined. If that assessment holds, the ECB's growth projections face a significant revision.

How long oil prices stay elevated and whether the ECB's hawkish shift can offset the growth drag will determine how far this move extends. The divergence between US and European energy security currently acts as a primary driver of price direction.

Key technical levels for EUR/USD: Resistance at 1.1600, 1.1680 and Support at 1.1500, 1.1420

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USD: Dollar Takes the Safe-Haven Bid

DXY 99.74

The US Dollar Index (DXY) climbed to 99.74 as retaliatory threats in the Middle East curbed risk appetite. Safe-haven demand surged, reversing the dollar's brief weekly decline seen on Friday.

The US holds a relative advantage as a net energy exporter, while Europe and Asia absorb rising import costs; the US sits on the revenue side of that equation. Traders now price in a tightening cycle, with some eyeing the Fed's next move despite hopes of a pause; the dollar lifts strongly across all majors. Fed Chair Jerome Powell dismissed stagflation concerns, noting that 4.4% unemployment and inflation near the 2% target represent a far sturdier foundation than the 1970s. This economic resilience, paired with 10-year yields at 4.4150%, makes the dollar the undisputed store of liquidity.

Trump set a 48-hour countdown for Iran to reopen the Strait of Hormuz, threatening to destroy energy infrastructure, with the largest nuclear plant cited as the first target; a move carrying significant implications under international law and serious environmental risk. Iran's Islamic Revolutionary Guard Corps (IRGC) responded with a threat to close the Strait completely. Oil prices swung in choppy trade, with the US allowing the sale of Iranian and Russian oil already on tankers, which helped cap some of the immediate demand shock.

The greenback continues to act as the primary beneficiary of global instability. With WTI Crude up 1.27% at $98.43 and the IRGC threatening the Strait of Hormuz, the dollar’s role as a shield against volatility is favoured by investors.

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Other Majors: Commodity and Carry Trade Pain

The Australian dollar and Kiwi both tumbled, with AUD/USD hitting 0.6969. Meanwhile, USD/JPY hovered at 159.50, just shy of a 20-month peak, prompting intervention warnings from Tokyo.

The Aussie dollar acts as a liquid proxy for global sentiment and Monday's reading was unambiguously risk-off; when Asian equities sell off, the Aussie follows. Despite the RBA's narrow rate hike to 4.1%, the first back-to-back increase since 2023, the currency is currently at the mercy of the global growth outlook. Wednesday's Australian CPI print will test whether that timing of hikes was well-judged. NZDUSD fell to 0.5804, following the Aussie lower in a broad risk-off move.

In Japan, top currency diplomat Atsushi Mimura signalled readiness to counter speculative forex volatility as the yen nears the critical 160.00 level. GBPJPY traded at 212.33. The yen's broad weakness across the crosses reflects Japan's deep energy import dependency and a central bank still dovish relative to global peers. The Nikkei shed over 3% and South Korea fell close to 6%. European futures opened 1.1% to 1.3% lower.

Gold fell 2.6% to $4,371 an ounce. Higher global rate expectations reduce the appeal of non-yielding assets; the repricing is technically consistent even amid elevated geopolitical stress. Investors wagering on tighter policy globally drove the move.

Oil drives the macro narrative, with Brent Crude and WTI prices higher; volatility reflects a Strait of Hormuz risk premium rather than a confirmed supply disruption, a distinction that will matter as the situation develops. Iran's threat to target desalination plants in neighbouring countries adds a layer of humanitarian and regional risk to the picture. Energy sits at the centre of this cycle. Its impact flows through inflation, rates, and currencies in sequence.

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Current Rate Table:

(Rates indicative at time of writing.)

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Market Lookahead:

Mon, 23 Mar (Today)

• EUR - ECB members speech
• AUD - S&P Global PMI (manufacturing, services, composite)
• JPY - CPI
• EUR - consumer confidence

Tue, 24 Mar

• EUR - HCOB PMI (Germany, eurozone)
• GBP - S&P Global PMI (manufacturing, services, composite)
• USD - S&P Global PMI (manufacturing, services, composite)

Wed, 25 Mar

• AUD - CPI (Feb)

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