"Washington's Warning: US Treasury Sees Japan's Currency Crisis as a Threat to American Interests. The U.S. Treasury is sounding the alarm over a weakening yen, warning that the currency's decline could have far-reaching consequences for American bond markets. As the Japanese economy struggles to recover, a weak yen could lead to increased demand for U.S. Treasury yields, potentially driving up borrowing costs for the government. In contrast, the European Central Bank's efforts to stabilize the eurozone are being largely ignored by Washington, indicating a growing focus on US economic interests."
The U.S. Treasury is mainly concerned about a weak yen boosting Treasury yields, and it has shown little regard for the European Central Bank.