- The United States and Japan have initiated their first joint intervention in the foreign exchange market in decades, using official reserves to directly purchase yen in order to curb the yen's depreciation against the dollar, which has reached its lowest level in nearly forty years. This move is seen as a strategic show of support from U.S. President Trump for Japanese Prime Minister Sanae Takaichi's political standing.
- The primary consideration for this joint intervention, led by U.S. Treasury Secretary Scott Bessent, is to prevent the volatile fluctuations in Japanese government bond yields from affecting the U.S. $31 trillion Treasury market, thereby preventing the yield on the U.S. 10-year Treasury from rising to its highest level since he took office.
- As a potential exchange condition for U.S.-Japan monetary policy coordination, Washington is closely monitoring the Bank of Japan's subsequent interest rate hike path. The market expects this joint action to be linked with Tokyo's accelerated increase in defense spending and the implementation of a $550 billion investment plan in the U.S.
Policy Demands of U.S.-Japan Joint Forex Intervention to Alleviate U.S. Debt Pressure
The U.S. and Japan have reached their first joint yen purchase intervention in decades, with the core strategic motive being to block the transmission mechanism of Japanese bond market turmoil to U.S. Treasury yields. U.S. Treasury Secretary Scott Bessent has repeatedly expressed concern over changes in Japan's holdings of U.S. Treasuries, as Japan is the largest foreign holder of U.S. debt. Rapid increases in Japanese government bond yields can easily trigger capital repatriation, thereby pushing up U.S. Treasury yields and raising the financing costs of U.S. debt under the Federal Reserve's rate-cutting cycle. By guiding the yen to stabilize, the U.S. aims to prevent Japanese officials from directly selling U.S. Treasuries (US10Y:IND) to intervene in the forex market.
Opportunity for Monetary Policy Normalization and BOJ Rate Hike Expectations
Washington views this forex intervention as a policy window to urge the Bank of Japan (BOJ) to accelerate the normalization of monetary policy. Current overnight swap market pricing shows that the probability of the BOJ announcing a rate hike at its September meeting is close to 50%, with a cumulative probability of completing the rate hike by October reaching 90%. U.S. policy officials have publicly stated that Japan catching up with global interest rate levels will fundamentally help improve excessive exchange rate volatility. Although Japanese Prime Minister Sanae Takaichi traditionally favors loose policy, under U.S. pressure, BOJ Governor Kazuo Ueda may gain more room for rate hike policies.
Defensive Asset Allocation and Domestic Bond Market Stabilization Measures
To address U.S.-Japan interest rate differentials and bond yield fluctuations, Japan's Ministry of Finance is promoting the reallocation of public pensions and retail capital to domestic assets. Japanese Finance Minister Satsuki Katayama has proposed encouraging public funds such as the Government Pension Investment Fund (GPIF) to increase domestic bond allocations and plans to include Japanese government bonds in the coverage of tax-free savings accounts (NISA). These capital guidance measures aim to bolster domestic bond purchases, reduce the crowding-out effect on the U.S. Treasury market, and thus smooth the abnormally steepening trend of the Japanese government bond yield curve.
Geopolitical Security Commitments and Dual Negotiations on U.S. Investment Implementation
The essence of this currency rescue action is the comprehensive counterbalance of U.S.-Japan bilateral negotiations, involving the fulfillment progress of defense budgets and cross-border investment commitments. Washington is using monetary cooperation as a bargaining chip to push Tokyo to align its defense spending ratio with a higher GDP percentage when revising its national security strategy document this year. At the same time, the U.S. is urging companies like SoftBank Group (9984:JP) to expedite the fulfillment of a $550 billion investment plan in the U.S., including the Ohio natural gas power plant, and the yen's appreciation objectively reduces the exchange costs of Japanese companies' overseas mergers and acquisitions and direct investments.
