By propping up the Japanese yen, the United States is effectively propping up its own dollar and, more importantly, the market for its own government bonds. The question is how much longer this dance can continue before energy prices force Japan to choose between saving its currency and paying its oil bills.
Friendship Worth $74 Billion
The Japanese yen collapsed to 164 per dollar, a 40-year low. Japan spent nearly $74 billion on solo interventions in April and May, but the effect didn't last long. Then Washington decided it was time to step in personally. On July 31, the US and Japan conducted their first joint intervention to buy yen since 1998. The yen jumped 4% to 157.5. Treasury Secretary Scott Bessent promised to do "whatever it takes." Tellingly, his notepad during the meeting read: "Buy yen - $5-10 billion." This isn't friendship, it's business.
Treasuries: Japan's Time Bomb
The main question is why the US would suddenly rescue someone else's currency. The answer lies in the $1.14 trillion in American government bonds held by Japan. If Tokyo had sold dollars alone to support the yen, it would have had to offload Treasuries. A mass sell-off would have crashed the market and sent yields soaring. So the intervention isn't altruism, it's an "element of self-preservation" - not support for an ally, but protection of America's own debt market from Japan's stress. The irony: America's largest foreign creditor has become its biggest financial headache.
An Oil Knife in the Yen's Back
But there's a catch: energy. Japan imports nearly 100% of its energy resources. The conflict in the Middle East has driven up oil and gas prices. To pay for imports in dollars, Japan is forced to sell yen and buy American currency. The higher oil goes, the weaker the yen gets, and the more effort interventions require to hold the exchange rate. It's a vicious circle: the US helps strengthen the yen, but rising oil prices push it back down. Interventions treat the symptom, not the disease.
A Reserve Line, Not a Rescue
Bessent has already hinted at a solution: Japan could use the Fed's FIMA repo facility to obtain dollars against Treasury collateral without selling them outright. The limit is $60 billion. It sounds like a panacea, but it's really just a delay. Former Treasury Secretary Tim Geithner put it bluntly: intervention only works as a "bridge to policy." And the Bank of Japan's policy - a 1% rate versus 3.5-3.75% in the US - makes the yen a perpetual underdog. Until that gap narrows, any intervention is just a temporary patch.
What Lies Ahead
One intervention won't be enough. The yen has already slipped back from 156 to 158 after its initial jump. If energy prices stay high, Japan will keep burning through dollars on imports, weakening its own currency in the process. And the US will be forced to keep bailing out its ally, again and again, so it doesn't dump Treasuries. But FIMA isn't a bottomless well, and the Fed is unlikely to cut rates while inflation persists. All of this raises a number of uncomfortable questions: who is really saving whom, how much longer is Washington prepared to spend resources to hold up a structure being undermined by the plain price of oil, and isn't this whole scheme being financed by the liquidation of euro reserves?
The answers are, most likely, unpromising: until the first serious shock hits the energy market.
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