The U.S. Treasury Department on Thursday said it expects currency-market interventions, like Japan’s in September, should be reserved for exceptional circumstances, as it kept Tokyo on a list of partners whose practices it is monitoring.

As the report notes, Japan in September intervened to support the yen USDJPY, -3.18% in the first such move since 1998. Japan last intervened to weaken its currency in 2011.

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In its semiannual report to Congress on foreign-exchange and macroeconomic polices of the U.S.’s major trading partners, Treasury made plain that it expects a high bar for such moves.

“Treasury’s firm expectation is that in large, freely traded exchange markets, intervention should be reserved only for very exceptional circumstances with appropriate prior consultations,” the report said.

The U.S. dollar dropped sharply against the yen USDJPY, -3.18% in response to the Sept. 22 intervention. The dollar briefly touched its highest level against the yen in more than 30 years in October, although dollar strength has eased a bit since.

In addition to Japan, Treasury said six other countries are on its monitoring list of major U.S. trading partners whose currency practices and economic policies warrant “close attention”: China CNYUSD, +0.76%, Korea KRWUSD, 1.41, Germany EURUSD, +1.65%, Malaysia MYRUSD, -0.18%, Singapore SGDUSD, +1.26% and Taiwan TWDUSD, +0.76%.

The report concluded that no major U.S. trading partner manipulated its currency versus the dollar for unfair trade advantages during the four quarters through June 2022.

Treasury reiterated its call for increased transparency from China. A senior Treasury official told reporters that the U.S. has not had much of a response from China about the U.S.’s call.