Dollar watch: Yen jitters expose cracks in greenback’s dominance

Wall Street’s fixation on a possible rescue of the yen is increasingly a story about the US dollar itself.

After a brief new year rebound, the greenback is again sliding against major currencies as investors weigh the prospect of US–Japan action in FX markets alongside mounting political and policy risks in Washington.  

The immediate catalyst is the sharp rally in the Japanese currency with the yen up roughly 3% in just a couple of sessions, lifting it to around ¥153–154 per dollar and away from Friday’s levels near ¥159, as traders respond to signs that authorities in both countries are prepared to lean against further yen weakness.  

A rare “rate check” by the New York Fed late last week in which officials contacted dealers about dollar-yen levels was widely interpreted as a signal that Washington is at least willing to contemplate intervention alongside Tokyo, according to the Wall Street Journal.  

For the dollar, the prospect of coordinated dollar‑selling comes at an awkward time with the US currency index having fallen to a four‑month low, the euro pushing toward $1.19, and sterling nearing $1.37, while higher‑beta currencies such as the Australian and New Zealand dollars also hold recent gains.   Reuters reports that the current three‑day decline in the dollar against a basket of peers is the steepest since last April, when “Liberation Day” tariffs from President Donald Trump triggered a broad sell‑off in US assets.  

Investors in US assets are now navigating several overlapping forces that all point to less enthusiasm for the greenback as a store of value. Talk of another government shutdown before a January 30 funding deadline, along with ongoing political turmoil, has added to what some strategists describe as a renewed “Sell America” impulse in global markets.  

The yen‑intervention story matters less as a technical FX operation than as a litmus test of international appetite for US assets and if US authorities ultimately join Japan in selling dollars to support the yen, it would mark a shift away from the long‑standing hands‑off approach to the currency highlighted in the Journal’s coverage.  

Even if intervention never materializes, the possibility appears to have reduced investors’ willingness to hold large long‑dollar positions, particularly with a contentious Fed policy debate and a potential change at the top of the central bank still in play.  

That leaves the dollar caught between external and domestic headwinds: a foreign‑policy stance that tolerates, and at times encourages, a softer currency, and a global backdrop in which key counterparts — from the euro to the yen — are finally finding room to claw back ground.