Japan intervened in the currency market overnight ahead of the Bank of Japan's policy meeting, catching traders off guard. USD/JPY had already weakened slightly during the European morning session, dipping from 163.30 to 162.28 before retracing to around 163.00. That pullback now appears to have been triggered by a rate check call, after which Tokyo officials stepped in more aggressively and drove the pair down to an intraday low near 158.00.

Despite the force of that move, the pair has since recovered approximately 200 pips. USD/JPY was trading back up to 160.70 heading into the European session, after the BOJ announced it would keep monetary policy unchanged, as widely expected. The policy hold leaves Japan's benchmark short-term rate at just 0.25%, compared with a U.S. federal funds rate target range of 5.25%–5.50%, sustaining one of the widest interest rate gaps among major currency pairs and a key driver of the yen's persistent weakness this year.

The intervention pushed USD/JPY lower but failed to produce a decisive technical breakout. While the decline briefly breached the 100-day moving average (currently at 160.06), it did not extend far enough to test the 200-day moving average below. The last time USD/JPY traded beneath both of these key technical levels was in July of the previous year — a reflection of the sustained upside momentum the pair has maintained since then, particularly since October when Takaichi assumed the role of prime minister.

Today's rebound has lifted price action back above the 100-day moving average, which preserves a more bullish technical posture, though the session remains in its early stages.

BOJ Governor Ueda is unlikely to address the overnight intervention directly, as the central bank typically avoids encroaching on the Ministry of Finance's domain over currency policy. Market participants can expect to hear standard talking points:

• No comment on specific FX moves or levels
• The importance of FX rates moving stably and reflecting economic fundamentals
• The BOJ does not target a specific exchange rate in its policy decisions

Meanwhile, the possibility of further intervention by Japan's Ministry of Finance remains open. During the spring intervention campaign — which unfolded over several days — authorities spent a record ¥11.7 trillion attempting to push USD/JPY lower after the pair breached the 160 level. However, it took only about six weeks before the exchange rate climbed back above that psychological threshold.

Given the current fundamental and macroeconomic backdrop surrounding the yen, upward pressure on USD/JPY persists. The Ministry of Finance has demonstrated it is actively engaged in the market, creating potential pitfalls for those attempting to buy the dip at this stage of the intervention operation.