As the week draws to a close, the Japanese yen has given back nearly half of the gains it made following the joint intervention by the US and Japan, prompting traders to speculate on the possibility of new market action by authorities.

On Friday morning, the yen was trading near 158.45 against the US dollar, a notable decline from the week's high of 155.23. This comes after the yen briefly touched a four-decade low of roughly 164 yen per dollar last week, which led to the first coordinated US-Japan yen-buying operation since 1998.

The retreat highlights the difficulty of reversing the yen's long-term downward trend through intervention alone. The currency remains under pressure from a combination of factors, including the substantial interest rate gap between Japan and the US, Japan's large debt burden, and ongoing geopolitical uncertainties.

Meanwhile, the US dollar recorded its largest single-day gain in two weeks on Thursday, fueled by rising oil prices, reflecting a fading optimism regarding a potential easing of tensions in the Middle East. Officials from both the US and Japan have issued warnings to investors, signaling that they are prepared to defend the yen's value decisively if necessary.