Asian stock markets showed mixed results on Monday following intervention by U.S. and Japanese officials to stabilize the yen . The market reaction also followed President Donald Trump's announcement of a potential deal to halt military actions against Iran.

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The $155.20 floor and the battle for the yen

The U.S. dollar dropped to a low of 155.20 against the yen as Japanese and American officials confirmed recent actions to support the Japanese currency. As the source reports, this intervention aimed to curb the dollar's ascent to 40-year highs against the yen. While a weaker yen typically benefits Japanese exporters and boosts tourism, it also increases the cost of essential imports like oil.

The Nikkei 225 index faced downward pressure during this period, losing 1.9% to settle at 63,140.68. This movement reflects the broader tension between supporting the yen's value and maintaining the competitive edge of Japanese companies with significant overseas operations.

Samsung and SK Hynix retreat after Friday's 17.9% Kospi surge

South Korea's Kospi index dropped 4.5% to 6,298.75 on Monday, reversing much of the massive 17.9% gain seen during the previous Friday's trading session. This volatility was driven largely by the tech sector; Samsung Electronics shares dropped 8%, while SK Hynix fell 7.8%.

Both companiees had previously seen gains exceeding 25% during Friday's historic market rally. The sudden retreat on Monday highlights the sensitivity of the South Korean market to shifts in global tech demand and currency stability.

A 5% drop in oil prices following Trump's Iran announcement

Energy markets reacted sharply to President Donald Trump's claim that a deal is in place to end fighting in the Middle East. According to the report, U.S. forces may be ordered to refrain from attacks against Iran, a development that sent Brent crude down 5% to $83.87 per barrel. U.S. benchmark crude also saw a significant decline, falling 4.8% to $80.58.

This lull in Middle East tensions has provided a temporary reprieve for energy prices, which had been elevated by geopolitical risk. However, the suddenness of the announcement has left traders reassessing the immediate premium on crude oil.

Amazon's 15.3% jump signals AI investment payoff

In the United States, Amazon shares surged 15.3% following a quarterly profit report that significantly exceeded analyst expectations. The company's profit more than tripled compared to the previous year, fueled by growth in its cloud computing division. Market analysts suggest this performance indicates that Amazon's massive investments in artificial intelligence are beginning to yield tangible financial results.

While Amazon thrived, other chip-related stocks experienced extreme volatility. The report notes that Micron Technology, for instance, saw its shares swing from an early 6.4% jump to a 6.5% loss before eventually closing down 5.9%.

Will the Trump-Iran deal hold enough to stabilize energy costs?

While the immediate market reaction to the Middle East news was a drop in oil prices, several questions remain regarding the long-term stability of this peace. It is currently unverifid whether the promised deal to end fighting will be formally ratified or if the U.S. military's restraint will be sustained. Furthermore, the report does not specify the exact terms of the agreement Trump referenced, leaving investors to wonder how much geopolitical risk remains in the region.