Brent crude pushed decisively above $90 a barrel after the 60-day US-Iran ceasefire framework expired without a diplomatic path forward. The shock has spread beyond energy: the US 30-year Treasury yield hit its highest level in nearly two decades, and the US 10-year is now near 4.75%. Currency markets are already flipping the usual playbook, with the Australian dollar and the US dollar leading while the Swiss franc and yen lag.
Brent's break spreads into bond markets
Brent crude broke decisively above $90 as the 60-day US-Iran ceasefire framework expired Tuesday with no diplomatic path forward. Iranian parliament speaker Mohammad Bagher Ghalibaf said the Strait of Hormuz would stay closed until Tehran's demands are met, including lifting the US blockade, releasing frozen assets, ending the oil embargo and stopping military threats. According to ActionForex, a senior Iranian official separately said Tehran is shifting toward a "fully offensive" posture.
President Donald Trump repeated that Iran must abandon any nuclear-weapons capability while escalating rhetoric over control of Hormuz. Military confrontation has stayed relatively contained so far, though UKMTO reported another vessel was struck by an unknown projectile in the Strait, causing engine-room damage and a crew casualty.
The US 30-year Treasury yield reached its highest level in nearly two decades, and Germany's 10-year Bund climbed to its highest since 2011. Bond markets are treating prolonged Hormuz disruption as an inflation problem rather than a passing geopolitical headline, since higher energy and freight costs could keep price pressure elevated even where recent data have softened.
US 10-year yield near 4.75% is the next test
That places the US 10-year yield near 4.75% at the center of the next market test. A sustained break above that level would signal the oil shock is spreading deeper into global financial conditions, forcing a broader repricing across equities, currencies and other interest rate-sensitive assets. If the 10-year fails around 4.75% and Brent settles after the current repricing, the broader impact could stay contained.
Aussie and dollar lead as havens lag
Currency moves show this is not a conventional risk-off episode. The Australian dollar is the strongest major currency so far, followed by the US dollar and euro, while the Swiss franc is weakest, the New Zealand dollar second weakest and the yen third. The Reserve Bank of Australia kept the door open to further tightening earlier this month, saying the cash rate could rise again if upside inflation risks materialize, which makes renewed oil pressure directly relevant to Australian rate expectations.
The dollar is drawing support from rising Treasury yields, with the probability of a September hold slipping toward 63%. Yet the greenback has not staged a decisive reversal after its recent broad selloff, suggesting the shift in Fed expectations remains limited for now.
Source: ActionForex
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