A recent Bloomberg article indicates that the yen's post-intervention gains are seen as temporary. The rally, which saw the yen strengthen by up to 5% over three trading sessions after Japan and the U.S. confirmed a coordinated yen-buying intervention, is expected to fade as the Federal Reserve continues with rate hikes, which will likely revive the dollar.

The coordinated action, which saw the yen reach a three-month high of 155.20 per dollar, was characterized by market commentators as a signal to traders against holding heavy short positions in the yen. Axel Merk, chief investment officer at Merk Investments, suggested the intervention was intended to change market behavior, noting that currency interventions usually have limited medium-term impact.

Indeed, the yen has already begun to retrace some of its gains. On Tuesday, it traded lower by 0.25% at 157.56 per dollar, and against the euro, it fell 0.33% to 181.36. Despite this pullback, the yen remains considerably stronger than its 40-year low of 163.99 recorded in July. However, analysts warn that the intervention's durability depends on Japan addressing the structural forces driving yen weakness.

While the intervention may buy time, it may not alter the long-term trajectory. Masahiko Loo, senior macro strategist at State Street, emphasized that while intervention can shape the next few months, Bank of Japan normalization and hedging flows will determine the next few years. The U.S. participated in the intervention due to its national interests, including avoiding a scenario where Japan might sell large quantities of Treasuries to finance unilateral intervention.

Concerns remain about the sustainability of these gains, as the yield differential between the U.S. and Japan remains wide, and the Bank of Japan is moving more slowly on normalization than the market might require for a sustained currency reversal.