US-Iran Armed Conflict Resumes in Strait of Hormuz, Background on 3% Oil Price Surge and KOSPI Impact

The resumption of armed conflict between the US and Iran in the Strait of Hormuz, a major global oil transit route, has caused international oil prices to surge by nearly 3% in the short term. This has fueled concerns about reigniting global inflation, leading to heavy selling by foreign and institutional investors and causing the KOSPI to open 0.52% lower as financial markets face significant turbulence.

Background of the 3% Oil Price Surge Amid US-Iran Conflict

The military tensions between the US and Iran, ongoing since late August 2026, have escalated into armed clashes near the Strait of Hormuz, turning concerns over crude oil supply chain disruptions into reality. The Strait of Hormuz is a critical chokepoint through which approximately 20% of the world's crude oil volume passes. Immediately following the news of the conflict, benchmark crude prices such as Brent and WTI surged by nearly 3% in the short term, threatening the $90 per barrel mark. Market experts project that the geopolitical risks originating from the Middle East are unlikely to be resolved swiftly, maintaining upward pressure on oil prices.

Fear of High Oil Prices and Risk Aversion, KOSPI Drops 0.52%

The sudden spike in oil prices is significantly stimulating fears of reigniting global inflation. Consequently, as US Treasury yields reversed upward, heavy selling emerged in tech-heavy indices like the NASDAQ. The domestic stock market was also hit hard. With foreign investors' risk aversion maximizing, the KOSPI opened 0.52% lower on September 1. In particular, due to South Korea's industrial structure, which is highly dependent on energy imports, concerns over rising manufacturing costs have led to concurrent declines in large-cap semiconductor stocks like Samsung Electronics and SK Hynix, as well as other top-tier stocks.

Frequently Asked Questions (FAQ)

Q. What is the impact of a potential Strait of Hormuz blockade on the global economy?

If the Strait of Hormuz is fully blockaded, the supply of millions of barrels of crude oil per day will be disrupted. This would lead to an immediate explosion in oil prices, causing increased global production costs and reduced consumption, and in the worst-case scenario, triggering stagflation.

Q. How does rising international oil prices affect expectations for an interest rate cut this year?

Rising oil prices directly translate into upward pressure on the Consumer Price Index (CPI). If the trend of slowing inflation is reversed, the likelihood of a dramatic interest rate cut this year by major central banks, including the US Fed, will inevitably diminish. The market is already expressing disappointment that a rate cut this year might be off the table.

Q. What is the stock market investment strategy in the current environment?

During phases of escalating geopolitical risk, short-term capital tends to flock to beneficiary themes such as oil refineries and defense stocks. Conversely, it is recommended to take a conservative approach, considering reducing exposure to growth stocks vulnerable to rising interest rates and manufacturing sectors burdened by high energy costs.