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#USJapanYenIntervention Japan and the U.S. just carried out their first coordinated currency intervention since 2011, stepping in Friday to halt the yen's slide to its weakest level in roughly 40 years. The yen had tumbled to 163.73 per dollar last Thursday before rebounding sharply to 157.57 on Friday after the two countries jointly bought yen and sold dollars. Japan's Ministry of Finance confirmed Monday that it may have spent as much as $36.6 billion on the operation, while the U.S. Treasury reportedly sold euros to help fund yen purchases. President Trump framed the move casually, telling reporters "they wanted a little bit of help, and we're always there for Japan," calling it mostly "a signal of friendship." U.S. Treasury Secretary Scott Bessent struck a more formal tone, saying the action "countered disorderly yen movements" and that Washington "will not hesitate to participate in further joint intervention." Behind the friendly framing, analysts see real stakes for both sides. For Japan, a persistently weak yen risks triggering further selling in Japanese government bonds, and Tokyo signaled it plans to tap the Fed's FIMA repo facility for future dollar liquidity — a move that lets Japan raise dollars without dumping U.S. Treasuries, easing concerns that solo intervention could spill over into U.S. funding markets. For the U.S., a weaker yen threatens to widen the trade deficit, and rising JGB yields could add pressure to already-climbing U.S. Treasury yields. It's the first joint yen-buying operation between the two countries since 1998, and with both governments explicitly promising more action if needed, currency traders are bracing for further intervention through the rest of the summer.