Middle East Conflict Escalates: Markets Plunge as Iran Threatens Strait of Hormuz Closure

Asian financial markets experienced significant volatility on March 23, 2026, as major share indexes in Japan and South Korea plummeted more than 5% amid escalating conflict in the Middle East. The turmoil follows a 48-hour ultimatum issued by U.S. President Donald Trump to Tehran to reopen the Strait of Hormuz or face potential strikes on Iranian power plants, a deadline set to expire on the evening of March 23 in New York. Iran has responded with a vow to indefinitely close the vital shipping lane and target energy infrastructure in the U.S. And Israel if attacked.

Market Reaction and Economic Impact

As of 12:30 PM Singapore time, key Asian indexes showed substantial declines:

• Japan’s Nikkei index: -3.85%
• South Korea’s Kospi index: -6%
• Hong Kong’s Hang Seng Index: -3.5%
• Shanghai Composite Index: -2.5%
• Singapore’s Straits Times Index: -2.1%

Brent crude oil initially jumped 1.9% before reversing course to fall nearly 1.8%, ultimately settling up 0.6% at US$112.89 per barrel at 12:26 PM Singapore time. Gold prices experienced a sharp drop of 4.4% to US$4,374 per ounce, reaching a four-month low, driven by inflation concerns and expectations of rising global interest rates. The inverse relationship between gold and interest rates stems from gold’s lack of yield; investors often shift to interest-bearing assets when rates increase.

Expert Analysis

“Markets are definitely getting more nervous about what’s happening in the Middle East right now,” said Martin Schulz, head of the international equity group at Federated Hermes, in a Bloomberg TV interview. “Our view is it is time for caution, not panic. Duration is the main issue. The longer this drags out, obviously the worse it gets.”

Global markets have been rattled by the ongoing conflict, with stocks and bonds selling off last week as concerns about inflation and slower economic growth intensified. This is also influencing policymakers, with Federal Reserve Chair Jerome Powell stating on March 18 that the U.S. Central bank requires further evidence of progress on inflation before considering rate cuts CNN.

The sell-off in the U.S. Accelerated on March 20 as traders began anticipating potential interest rate hikes by the Federal Reserve in 2026 due to the threat of rising oil prices and a renewed inflation shock. Markets are bracing for similar actions from central banks in Japan, Europe, and Britain, even as the conflict simultaneously dampens global economic growth prospects.

Strait of Hormuz and Global Energy Supply

The standoff over the Strait of Hormuz – a critical waterway through which approximately 20% of the world’s oil and liquefied natural gas normally flows – has exacerbated an existing supply crisis, impacting gasoline prices, fertilizer costs, and food production CNN. Traffic through the strait has effectively halted since the conflict began at the end of February.

Shifting U.S. Strategy and Iranian Response

Following market closures on March 20, President Trump indicated a potential shift in strategy, suggesting he was considering winding down military efforts in Iran, claiming the U.S. Was “very close” to achieving its objectives. However, subsequent threats to bomb power plants – and Iran’s firm vow to retaliate – demonstrated limited progress toward a ceasefire AP News.

“It’s a soft start for risk, but perhaps surprisingly contained given the ultimatum hanging over the market,” noted Chris Weston, head of research at Pepperstone Group in Melbourne CNN.