US-Japan Coordinated Yen Intervention: US Buys Yen with Euros in Unusual Move

The US Treasury intervened in the yen market on Friday by buying yen through selling euros rather than dollars, coordinating with Japan which spent up to $36.58 billion, confirming rare bilateral action to support the currency.

The coordinated foreign exchange intervention between the US Treasury and Japanese authorities represents a significant escalation in efforts to stabilize the yen amid its prolonged weakness. Reports confirm that the US side executed yen purchases by selling euros, a highly unusual tactic designed to avoid any perception of dollar weakness while still providing support to the Japanese currency. This approach, revealed through market sources and confirmed by Reuters and FT reporting, underscores the strategic alignment between Washington and Tokyo following months of preparation, including rare rate checks by the New York Fed earlier in the year. Japan’s Finance Ministry explicitly confirmed the joint action on Monday, with Treasury Secretary Scott Bessent stating that the moves countered disorderly yen movements and signaling readiness for further steps if needed. The scale of Japan’s involvement, potentially reaching $36-59 billion based on BOJ data, highlights the determination to push back against speculative positions that had driven the yen to multi-decade lows. This intervention matters because it introduces a new dynamic of explicit US backing for yen strength, potentially altering market expectations around currency policy coordination. It directly impacts USD/JPY trading by providing a floor, while the euro sale method could influence EUR crosses and broader risk sentiment. Traders should monitor upcoming US payrolls data, any further verbal interventions from Bessent, and BOJ policy signals, as persistent underlying drivers like Japan’s fiscal expansion under Prime Minister Takaichi may test the intervention’s longevity. The move also raises questions about future coordination with the Bank of Japan on rate policy to sustain yen support without broader dollar implications.