European central bankers leave Jackson Hole wary of US unilateralism

European central bankers departed the Jackson Hole Economic Symposium this week harboring fresh anxieties about Washington's willingness to upend the conventions of international financial cooperation, with some officials warning that even the Federal Reserve's dollar swap lines — a cornerstone of global financial stability — could eventually become collateral damage of the Trump administration's unilateral approach.

A Currency Intervention That Blindsided Europe

The unease traces back to August 1, when U.S. Treasury Secretary Scott Bessent confirmed that the Treasury had sold euros to purchase Japanese yen through its Exchange Stabilization Fund, supporting Tokyo's effort to arrest the yen's slide to 40-year lows. The operation, executed through Goldman Sachs ↗ 0.07% and Morgan Stanley ↗ 0.26%, was Washington's first joint yen-buying intervention with Japan in more than a decade.cnbc+2

What rattled European officials was not the intervention itself but the lack of prior notice. According to Reuters, the European Central Bank was informed only after the trade was completed, with ECB President Christine Lagarde and Bessent speaking the following day. Senior ECB officials viewed the use of euros — rather than U.S. dollars — as an unprecedented breach of longstanding conventions among Western monetary authorities.businesstimes+1

"It was extremely irritating. Normally, in such cases, you pick up the phone and give notice," one official told Reuters. "To me, this means that the United States does whatever it wants."mezha

Bond Buybacks and Fed Independence

At Jackson Hole, which ran August 27–29, European officials also expressed concern over Bessent's plans to expand buybacks of longer-dated U.S. government bonds. They feared the strategy amounted to an unconventional attempt to suppress borrowing costs and questioned whether the administration might eventually pressure the Fed to purchase bonds directly.nationthailand+2

A U.S. Treasury representative maintained the buybacks were designed to improve liquidity, not to conduct monetary policy or impose interest-rate ceilings. The Treasury Borrowing Advisory Committee offered a similar explanation.nationthailand

Swap Lines: The Unspoken Fear

The deepest anxiety concerned the Fed's standing dollar swap lines with five major central banks, which allow foreign financial institutions to access U.S. dollars during periods of acute market stress. Officials worried that an administration willing to impose retaliatory trade policies on allies could treat dollar liquidity as leverage.reuters+1

"If they pursue retaliatory trade policies even against their closest allies, Trump could simply say they are profiting from the United States, and the swap lines could disappear overnight," a third official said.mezha

No direct signals have emerged that the swap lines are under threat, and officials expect them to remain intact. The facilities are authorized by the Federal Open Market Committee, not the White House. Fed Chair Kevin Warsh, attending his first Jackson Hole symposium, sought to ease tensions, having traveled to Europe shortly after taking office and posing for a customary photograph with Bank of Canada Governor Tiff Macklem amid rising U.S.-Canada trade friction. Bessent is set to discuss financial stability with G20 finance ministers and central bank governors in Asheville, North Carolina.fortune+2