Global markets began a volatile week marked by rising tensions in the Middle East and continued concerns about artificial intelligence stocks. The conflict between the U.S. and Iran, including the reported killing of Supreme Leader Ayatollah Ali Khamenei, sent crude oil prices soaring. Brent crude, the international benchmark, surged by 9.6% to $83.30 per barrel after both the United States and Iran claimed control over the Strait of Hormuz, a critical chokepoint for oil shipments. This geopolitical event was exacerbated by President Donald Trump's announcement of reinstating a blockade on Iranian oil tankers and imposing a 20% payment on all cargo passing through the strait to fund U.S. protection efforts.

Simultaneously, the artificial intelligence sector, which had been a significant driver of recent market gains, faced renewed jitters. High-flying AI stocks, particularly those of computer chip and memory companies, experienced sharp reversals. For example, Micron Technology saw its stock price swing from an initial 4% gain to a 10% plunge before closing down 1.4% on Tuesday, after a 9.9% jump the previous day and a 13.3% drop two days prior. The S&P 500, after an initial 1% gain, fell 0.3% on Tuesday, while the Nasdaq composite dropped 1%. The Dow Jones Industrial Average, after significant intraday volatility, ended up 0.2% on Tuesday, following a 1,200-point drop shortly after the opening bell.

These market movements reflect a divergence in investor reaction. While geopolitical events historically have not always translated into long-term impacts on U.S. corporate profits, the current situation is creating short-term uncertainty. Investors are grappling with the immediate effects of rising oil prices and the potential for broader economic disruption from the Middle East conflict, alongside ongoing questions about the sustainability and valuation of the AI stock boom. This dual pressure from both a "war trade" and an "AI scare trade" is contributing to the heightened volatility observed across global equities.