- During the G7 finance ministers and central bank governors meeting in Paris, Japan's Finance Minister, Katayama Satsuki, sent a clear signal of policy intervention, indicating that the Ministry of Finance is ready to take appropriate actions at any time to stabilize the domestic currency exchange rate against irrational fluctuations in the foreign exchange market.
- Internal estimates show that since the latest round of open market operations began on April 30, Japan's authorities may have used nearly 10 trillion yen (approximately 63 billion USD) in funds. This marks the first direct return of Japanese officials to the foreign exchange settlement market in nearly two years.
- The official core policy statement emphasizes that future operations of buying yen and selling dollars will be based on the core premise of not pushing up U.S. Treasury yields. Currently, there is still ample cash deposits, maturing assets, and interest income within the 1.4 trillion USD foreign exchange reserves.
Approaching Intervention Threshold and Long Position Unwinding
After a technical rebound in early May, the yen-dollar exchange rate gradually retraced more than half of its previous gains to the 155 level in the international spot forex market. Due to speculative short positions accumulating again, the yen's exchange rate is once again approaching the critical psychological and administrative intervention threshold of 160. Katayama Satsuki pointed out that the recent sharp fluctuations in the exchange rate are largely influenced by the wide swings in global oil prices, the escalation of the Middle East situation, and high-leverage speculative trading activities in offshore markets. The Ministry of Finance's statement aims to reaffirm to G7 member countries the rationale for maintaining macro-financial market stability and to send a signal of normalized counteraction to market shorts.
Cross-Border Asset Reserves and U.S. Treasury Yield Defense
Given Japan's unique financial position as the largest overseas holder of U.S. Treasuries, the liquidation path of its foreign exchange reserve assets is closely watched by the global fixed income market. There was widespread concern that if Japanese authorities were to raise the necessary dollar positions for intervention by massively selling their 1.4 trillion USD U.S. Treasury assets, it would inevitably lead to systemic upward pressure on long-term U.S. Treasury yields, indirectly strengthening the dollar index and causing the domestic currency defense action to fall into a counterproductive vicious cycle. In response, technical officials from the Ministry of Finance have clearly reiterated that the asset allocation structure within the foreign exchange reserve pool is highly optimized, and there is no need to use long-term U.S. Treasury stock.
Cross-Border Resonance of Bilateral Fiscal Policy Stance
The policy stance articulated by Katayama Satsuki this time shows a high degree of cross-border consistency at the macro level with the previous policy statements of U.S. Treasury Secretary Scott Besant. During his earlier visit to Tokyo, Besant publicly reiterated that the U.S. and Japan have a deep bilateral consensus on preventing excessive fluctuations in the exchange rate market. The U.S. side remains highly cautious about the volatility of the 10-year U.S. Treasury yield, which is the anchor of global asset pricing. It is evident that Japanese authorities are currently trying to achieve a fine-tuned sovereign credit balance between the internal demand goal of stabilizing the yen exchange rate and the external constraint of protecting the stability of the world's largest bond market.
Repricing in the Forward Forex Derivatives Market
If speculative funds in offshore markets continue to test the official marginal bottom line, the actual intervention frequency of the Ministry of Finance in the liquidity window may show a stepwise increase. Current micro indicators of the forex swap market and forward option implied volatility show that some multinational macro hedge funds have begun to factor in the risk premium of a non-linear rebound of the yen in their multilateral position management. If external variables such as the Middle East geopolitical conflict do not see substantial relief in the subsequent macro cycle, leading to persistent input inflation eroding Japan's current account, market pricing models may face deeper reconstruction, forcing policy authorities to make more rigid decision choices at the boundary of the impossible trinity.
