The market's muted response to both the BOJ hike and the Katayama-Bessent alignment language is the most telling signal in MUFG's note: verbal intervention and policy tightening are doing the job of slowing yen weakness but neither is reversing it, which leaves Tokyo increasingly reliant on the credibility of the threat rather than its execution. USD/JPY remaining below 161.95 shows the threshold is being respected, but the inability of 16 basis points of priced October hikes to generate a meaningful yen recovery suggests structural selling pressure is overwhelming the rate differential story. The joint intervention angle is the wildcard: Washington's participation in March 2011 was a one-off response to an acute shock, and any signal that the US is genuinely prepared to act alongside Tokyo in current conditions would represent a significant escalation with outsized market impact relative to what unilateral Japanese action alone could achieve.---MUFG says the yen is holding below the July 2024 high of 161.95 as intervention risk builds, with joint US-Japan action speculation growing after Katayama said she and Bessent agreed to take "bold steps" on currencies. Summary:MUFG said USD/JPY remains below the July 2024 peak of 161.95, with the heightened threat of intervention helping to slow but not reverse the pace of yen weakness, per the MUFG noteFinance Minister Katayama told reporters after her call with US Treasury Secretary Bessent that the two sides agreed to take bold steps on currencies if needed and described the nations as increasingly aligned on foreign exchange policy, per MUFGThe alignment language has fuelled speculation the US could participate in joint intervention alongside Japan, a step MUFG noted has not occurred since March 2011 when coordinated action followed the earthquake and tsunamiPressure on Tokyo to act has intensified after the BOJ's most recent rate hike failed to arrest the yen's weakening trend, per MUFGThe BOJ's Summary of Opinions from the June policy meeting, which MUFG characterised as the minutes, showed the board has become less concerned about downside growth risks while many members flagged awareness of upside price risks, with one or two potentially ready to propose a hike as early as September or October, per the noteOne board member said it is desirable to consider raising the policy rate at intervals of a few months, and Japanese rate markets are now pricing approximately 16 basis points of hikes by October, though the repricing has not generated a stronger yen, per MUFGMUFG said the yen remained pinned close to its recent lows against the dollar on Thursday, with USD/JPY holding just below the July 2024 high of 161.95 as the threat of intervention continued to act as a brake on further weakness following a high-profile exchange between Japanese Finance Minister Katayama and US Treasury Secretary Scott Bessent earlier in the week.Katayama told reporters after the call that the two sides had agreed to take bold steps on currencies if warranted and described Japan and the United States as increasingly aligned on foreign exchange policy. The language, as MUFG noted, has stoked speculation in currency markets that Washington could participate alongside Tokyo in coordinated intervention, a step that would carry substantially more firepower than unilateral Japanese action. The last time the United States joined such an operation was in March 2011, when the Group of Seven acted together to cap a yen that had surged in the immediate aftermath of the earthquake and tsunami.The intervention threat has taken on added urgency after the BOJ's most recent rate hike failed to arrest the yen's decline. The BOJ's Summary of Opinions from the June policy meeting, released overnight and described by MUFG as the minutes, added to the hawkish backdrop, showing the board has become less concerned about downside risks to growth while a number of members expressed heightened awareness of upside risks to prices. The document suggested one or two members may be prepared to propose a further rate increase as early as September or October. One member stated it would be desirable to consider raising the policy rate at intervals of a few months, language pointing to an active internal debate about the pace of tightening rather than simply its direction.Japanese rate markets have absorbed the signal, pricing approximately 16 basis points of additional hikes by October. However, as MUFG observed, the repricing has not yet translated into a meaningful yen recovery, leaving the exchange rate channel that the BOJ itself has cited as a key inflation amplifier through import costs stubbornly unresponsive to the tightening cycle. That dynamic places the intervention threat, and the question of whether Washington is genuinely prepared to act alongside Tokyo, at the centre of the yen's near-term outlook. This article was written by Eamonn Sheridan at investinglive.com.