Claim: For the first time in nearly three decades, the United States joined Japan in a currency intervention by buying yen through the New York Fed acting for the US Treasury.
Verdict: Correct (75% confidence)
Explanation: According to the Wall Street Journal, the U.S. and Japan intervened to support the yen, marking their first joint action since 1998. The Financial Times also confirms that the U.S. Treasury intervened in yen exchange rates, highlighting the historic nature of this joint effort. The New York Times reports that the U.S. Treasury joined efforts in Tokyo to stabilize the yen, further supporting the claim. Although Reuters mentions a previous intervention in 2011, it refers to a different context, wh...