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Dollar near one-week high as US-Iran tensions flare, yen nears intervention zone - Finance news and analysis from Global Banking & Finance Review
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Dollar near one-week high as US-Iran tensions flare, yen nears intervention zone

Published by Global Banking & Finance Review

Posted on May 28, 2026

3 min read

· Last updated: May 28, 2026

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US dollar weakens on reports of ceasefire deal between US and Iran

By Chibuike Oguh

Market Reactions to US-Iran Ceasefire Reports

US Dollar Performance and Middle East Conflict Impact

May 28 (Reuters) - The U.S. dollar fell against major currencies on Thursday after reports the U.S. and Iran had reached an agreement to extend a ceasefire, though several similar reports over the course of the three-month conflict have not resulted in an end to the war.

The dollar has swung in recent weeks, in line with the shifting outlook on the Middle East conflict, gaining when markets expect a prolonged stand-off and falling when reports signal a move toward de-escalation.

Details of the Ceasefire Agreement

According to four sources familiar with the matter, the agreement would extend the truce for another 60 days and allow traffic to flow through the strategic waterway while negotiators tackle difficult issues such as Iran's nuclear program.

Axios was the first to report the agreement.

Currency and Market Movements

Major Currency Reactions

The euro gained 0.20% against the dollar to $1.1649. Against the Swiss franc, the dollar weakened 0.37% to 0.784.

The dollar index, which measures the greenback against a basket of currencies including the yen and the euro, fell 0.3% to 99, putting it on track to snap two sessions of gains following the resumption of hostilities between the U.S. and Iran. 

US Equity and Bond Markets

U.S. equity markets gained on the day with the Nasdaq adding nearly 1%. U.S. Treasury bond yields fell. The yield on benchmark U.S. 10-year notes fell 2.8 basis points to 4.453%.

US Economic Data and Federal Reserve Outlook

Soft US Data

SOFT U.S. DATA

U.S. inflation increased at its fastest pace in three years in April, driven by higher energy prices amid the war with Iran, signalling that the Federal Reserve could hold interest rates unchanged for longer. 

PCE Inflation and Economic Growth

The personal consumption expenditures (PCE) price index rose 0.4% month-on-month in April after shooting up 0.7% in March. However, core PCE inflation, which excludes food and energy prices, gained 0.2% in April on a monthly basis after advancing 0.3% in March. 

U.S. economic growth for the first quarter was also revised lower. 

Market Strategist Commentary

"The combination of core PCE, which came in a little bit softer, and the growth data also coming in a little softer sends a message that perhaps that the Fed can be a little bit less aggressive with its higher-for-longer, which is somewhat risk-supportive," said Joel Kruger, market strategist at London-based LMAX Group.

"Ultimately, until we figure out a resolution to the geopolitical side and what it's going to be with inflation, it's a lot of kind of just choppy and directionless trade."

Global Currency Watch

On Watch for Yen Intervention

ON WATCH FOR YEN INTERVENTION 

Investors are eyeing whether Japanese officials would step in again to support the yen as it trades near the 160-per-dollar psychological level.

The Japanese yen was up 0.19% against the greenback to 159.22 per dollar. 

Australian and New Zealand Dollar Movements

The risk-sensitive Australian dollar was up 0.32% to $0.71645. The Aussie dollar remains the top-performing G10 currency versus the U.S. dollar this year, rising 7.35% year-to-date.

The New Zealand dollar rose 0.51% to $0.59315, adding to gains from the prior session after the Reserve Bank of New Zealand signalled a hawkish shift.

(Reporting by Chibuike Oguh in New York; Editing by Kirsten Donovan and Deepa Babington)

Key Takeaways

  • US strikes in Iran intensified geopolitical tensions, supporting the safe‑haven US dollar and lifting oil prices, which may complicate peace negotiations.
  • The yen dropped to its weakest since April and edged toward the intervention‑trigger ¥160 level, raising speculation of further Japanese FX action ahead of BOJ’s June meeting (70% odds of a 25bp hike).
  • Markets are now focused on the April core PCE deflator release—scheduled May 29 (08:30 ET)—the Fed’s preferred inflation gauge that will be pivotal for interpreting future US monetary policy.

Frequently Asked Questions

Why is the US dollar near a one-week high?
The US dollar is near a one-week high due to new US strikes in Iran and ongoing geopolitical tensions, raising demand for safe-haven assets.
What triggered the yen to approach the intervention zone?
The yen weakened towards 160 per dollar, a level where Japanese authorities intervened last month to stabilize the currency.
How are US-Iran tensions affecting markets?
US-Iran tensions have complicated peace talks, increased market volatility, and led investors towards the dollar for safety.
What is the significance of the Fed's core PCE deflator release?
The core PCE deflator is the Fed's preferred inflation gauge and will influence the outlook for US interest rates.
How did oil prices respond to the recent events?
Oil prices rebounded as hopes for a swift US-Iran resolution faded due to new military strikes and persistent tensions.

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