On January 23, the FX market painted a strikingly divergent picture: the Japanese yen remained weak after the Bank of Japan (BOJ) kept interest rates unchanged, while the U.S. dollar headed for its steepest weekly drop since June 2025 as geopolitical tensions and sudden policy shifts linked to Greenland unsettled investors.

The key takeaway: this is no longer a simple “rates vs. exchange rates” story. It has become a confidence test confidence in how quickly the BOJ will tighten further, and confidence in the USD’s credibility as the world’s reserve currency when policy and geopolitical risks spike.

BOJ Holds at 0.75%: Markets Wanted a More Hawkish Signal, but the BOJ Stayed Cautious

The BOJ kept its policy rate at 0.75% (8–1 vote) and raised its growth and inflation forecasts in its January Outlook Report.
Technically, this suggests the BOJ is not ruling out further hikes but it also did not deliver a forceful enough message for markets to confidently price in an imminent move.

At the press conference, Governor Kazuo Ueda reiterated a data-dependent stance, said financial conditions remain accommodative, and noted the BOJ is closely monitoring longer-term rates and FX developments.

Result: the yen didn’t get the “policy support” markets were hoping for, and remained under pressure.

Why Is the Yen Still Weak Even After Japan Lifted Rates to Multi-Decade Highs?

In recent weeks, Japan has moved rates up to 0.75% (the highest in decades), yet the yen has struggled to stage a sustained rebound due to three main headwinds:

• Interest-rate differentials & capital flows: even with Japan hiking, real and expected yields still lag higher-yielding currencies, limiting a durable reversal in flows.

• Expectations of a “slow hiking pace”: markets wanted a clearer hawkish pivot, but this decision was widely seen as neutral.

• Intervention risk near 160: as USD/JPY approaches a sensitive zone, traders worry Tokyo could step in yet that risk alone doesn’t generate persistent yen demand without stronger BOJ guidance.

After the decision, USD/JPY was reported around 158.5, with attention shifting to Ueda’s tone for clues about the next hike and whether the BOJ will lean more hawkish to support the yen.

Japan’s Domestic Risk: Bond-Market Turbulence as Early Election and Fiscal Debate Shake Confidence

A major additional weight on the yen is fiscal uncertainty.

• Reuters and AP reported that Prime Minister Sanae Takaichi dissolved the lower house and called an early election for February 8, amid debate over support measures and tax proposals.

• The bond market reacted sharply: long-end JGB yields jumped as investors questioned fiscal discipline, and higher volatility lifted the “risk premium” on Japanese assets.

When bonds are already volatile due to fiscal questions, the BOJ is even less able to “move fast” with rate hikes because tightening too quickly can raise borrowing costs across the economy and for the government. This feedback loop keeps the yen from strengthening decisively.

The Dollar’s Weekly Slide: Greenland and “Policy Shocks” Rattle Sentiment

On the other side, the U.S. dollar had a shaky week. Reuters put the DXY around 98.366, on track for about a ~1% weekly decline, its worst since June 2025.

The main driver has been a series of “policy shocks”:

• President Donald Trump made a sequence of statements and moves tied to Greenland ranging from tariff threats to pullbacks, saying a deal was being negotiated and emphasizing “total access,” while also ruling out the use of force.

• Market coverage (Bloomberg/Swissinfo) also described bouts of risk-off as equities, bonds, and the dollar swung on Greenland- and tariff-related uncertainty.

A notable angle in the USD debate: some strategists warn that if cracks between allies persist, that is not an ideal backdrop for maintaining the USD’s reserve-currency status.

What Markets Are Watching Next

Three key “headlights” for the coming sessions:

1. BOJ communication & Ueda’s tone
   If the BOJ turns just one notch more hawkish acknowledging FX pass-through risks, emphasizing inflation upside risks, or hinting at timing rate-hike expectations could firm and support the yen.

2. Japan’s election and fiscal credibility
   Clarity on tax/spending plans and how concrete the government is about stabilizing the bond market—will matter for JGB yields and yen sentiment.

3. Greenland and geopolitical risk (especially tariffs)
   If policy messaging continues to swing sharply, the dollar could face further pressure—global capital dislikes uncertainty, and it gets priced quickly.

Source: Reuters