The Japanese yen surged to a one-month high against the U.S. dollar on Thursday as traders increased bets on further Bank of Japan interest-rate hikes and weighed the possibility that Tokyo could intervene again to support the currency.

The yen climbed more than 1% against the dollar, reaching ¥156.15, its strongest level since Aug. 3, according to LSEG data. It was trading around ¥156.40 per dollar at 6:20 a.m. ET and also strengthened against the euro and British pound.

The move marks a sharp reversal from earlier in the week, when the yen breached the psychologically important ¥160-per-dollar threshold. That level has become a key focus for markets because sustained weakness beyond it could increase pressure on Japanese authorities to act.

Atsushi Mimura, Japan’s vice finance minister for international affairs, said Thursday that authorities were “neither satisfied nor reassured” by recent currency moves and remained “on a state of heightened alert,” according to Reuters.

His comments bolstered the perception that Tokyo is closely monitoring the yen and could respond if movements become excessively rapid or disorderly.

Intervention or Rate-Hike Repricing?

Thursday’s rally followed a similar roughly 1% jump in the yen on Wednesday, prompting speculation that Japanese authorities might have intervened in the foreign-exchange market.

Japan has already demonstrated its willingness to deploy substantial resources to support the currency. The Finance Ministry said the country spent a record ¥15.4 trillion, equivalent to about $98 billion, on yen-buying intervention between July 30 and Aug. 26.

The United States also confirmed its participation in a coordinated effort at the end of July, using foreign-currency holdings to purchase yen. Washington has not disclosed the exact amount, although a Reuters photograph of U.S. Treasury Secretary Scott Bessent’s July 31 notepad appeared to reference a plan to buy between $5 billion and $10 billion of yen.

Bessent said Monday that he expected the Japanese government and BOJ to take measures that would strengthen the yen. He has also privately urged Japanese officials to provide clearer communication about the country’s interest-rate trajectory, according to local media reports.

Yet analysts remain divided over whether the latest yen surge represents another intervention.

Takuji Okubo, chief economist at Japan Macro Advisors, said it was “possible” that Thursday’s move reflected intervention, but argued that the more likely explanation was a market reassessment of the BOJ’s policy outlook following recent comments from Governor Kazuo Ueda.

“I do not think [the Ministry of Finance] has done this kind of small stealth intervention in recent history,” Okubo said. “So it is probably just a reaction to BOJ Governor Ueda’s comment cementing the high likelihood of a BOJ rate hike in September.”

ING’s global head of markets, Chris Turner, also questioned whether Wednesday’s move was intervention, pointing to the absence of significant disruption in electronic foreign-exchange matching systems at the time.

But a sustained appreciation driven by monetary policy would be fundamentally different from a temporary move engineered by government purchases of yen.

The BOJ’s next policy meeting is scheduled for Sept. 18, and markets are increasingly pricing the possibility of another rate increase.

BOJ board member Hajime Takata said Wednesday that the central bank should raise rates “nimbly” in response to rising inflation, suggesting policymakers could move faster or make larger adjustments than the roughly semiannual pace seen recently.

Ueda also left the door open to higher rates in comments on Tuesday.

The BOJ’s dilemma is becoming more acute. A weak yen raises the cost of imported energy, food and other goods, potentially keeping inflation elevated. A stronger currency, by contrast, can ease imported inflation but could weigh on exporters and economic activity. The prospect of higher Japanese rates is therefore becoming an increasingly powerful force in the foreign-exchange market because it narrows the interest-rate differential between Japan and the United States.

For years, the yen was heavily used to finance so-called carry trades, in which investors borrowed cheaply in Japan and invested in higher-yielding assets overseas. As Japanese rates rise and the potential return from holding dollars declines relative to the cost of funding in yen, some of those positions become less attractive and can be unwound, creating additional demand for the Japanese currency.

Yen Weakness Is Also A Treasury-Market Issue

The implications extend well beyond Japan’s currency market. Japanese investors are the largest foreign holders of U.S. Treasury securities, with roughly $1.1 trillion of U.S. government debt on their books as of June, according to the U.S. Treasury.

Analysts say a prolonged period of yen weakness could encourage Japanese investors to reduce overseas holdings or increase currency hedging, potentially affecting demand for U.S. government debt. Conversely, a stronger yen could make foreign assets more expensive for Japanese investors in yen terms and alter the attractiveness of U.S. Treasury investments.

That makes the yen an important transmission channel between Japanese monetary policy and global bond markets. The issue is particularly significant while global government bond yields are already elevated. Investors are assessing the combined impact of inflation, large fiscal deficits, heavy government borrowing and divergent central-bank policies.

Japanese government bond yields eased Thursday following a solid auction of 30-year debt, offering some relief after a sharp sell-off in longer-dated bonds.

Japan’s bond market has faced pressure as investors assess the government’s fiscal position and the scale of spending expected under its 2027 budget. Higher long-term yields can increase borrowing costs for the Japanese government while also making domestic bonds more attractive relative to foreign assets.

The interaction between currency, interest rates and government bonds is therefore becoming more relevant. Economists note that if the BOJ raises rates and Japanese bond yields continue climbing, domestic investors may have greater incentives to keep capital at home. That could support the yen while potentially reducing Japanese demand for overseas bonds, including U.S. Treasuries.

Deutsche Bank analysts said markets were also watching the possibility of intervention during thin trading conditions around Japan’s “Silver Week” holidays, which could amplify currency movements.

Fed Policy Limits The Yen’s Upside

The yen’s rally nevertheless faces an important counterforce: U.S. interest rates. Markets have recently increased expectations for another Federal Reserve rate hike this month following hawkish comments from Fed Chair Kevin Warsh. Higher U.S. rates would preserve a substantial yield advantage for dollar-denominated assets, limiting how far the yen can strengthen without a more decisive shift from the BOJ.

Turner said a sustained yen recovery would probably require a significantly more hawkish BOJ as well as new measures designed to encourage domestic investment in Japan.

The result is a three-way contest between monetary policy, government intervention and capital flows.

Tokyo can intervene directly in foreign-exchange markets, but intervention alone is unlikely to produce a durable change in the yen’s underlying trend if the interest-rate differential with the United States remains wide. A credible BOJ tightening cycle, meanwhile, could strengthen the currency more sustainably by changing the economic incentives behind global capital flows.

For investors, the ¥160 threshold may therefore remain less important than what happens after it, according to economic experts. They believe that if the yen continues strengthening toward ¥155 and below without intervention, it would suggest that expectations of higher Japanese rates are increasingly driving the market. If the currency repeatedly approaches ¥160 and then experiences abrupt rallies, speculation about official intervention is likely to remain intense.

The Sept. 18 BOJ meeting has consequently become a critical event for global markets, with the yen, Japanese government bonds and potentially U.S. Treasuries all exposed to the central bank’s next move.

China has accused other G20 economies of using concerns over trade imbalances and industrial overcapacity to justify protectionist measures, escalating a dispute over Beijing’s growing export dominance as the United States and Europe push for greater access to the Chinese market.

The confrontation followed comments by U.S. Treasury Secretary Scott Bessent on Tuesday that 19 of the G20 members had agreed to address what he described as an “unsustainable equilibrium” created by a “stream of cheap exports.” China was the only member to dissent from a joint statement because of references to economic “imbalances.”

China’s Commerce Ministry rejected the criticism on Thursday, noting that the growing focus on overcapacity and trade imbalances was being used as a pretext to restrict Chinese companies.

“China believes that taking advantage of the G20 and other multilateral mechanisms to hype up so-called ‘economic imbalances’ and ‘overcapacity’ is essentially promoting protectionism,” Commerce Ministry spokesperson Ling Huang said at a weekly press conference.

“China is firmly opposed,” she said. “This will only disrupt the global economic and trade order, and harm the healthy development of the global economy.”

The dispute has added to the widening fault line in the global trading system. The U.S. and European governments have been warning that China’s vast manufacturing capacity, government support for strategic industries and weak domestic demand are generating exports at prices that put pressure on producers abroad.

Beijing, however, has consistently rejected claims that its exports are driven primarily by excess capacity or unfair state support. Chinese officials say that the country’s industrial competitiveness is the result of investment, technological development and supply-chain efficiency, and that foreign governments are seeking to protect domestic industries from Chinese competition.

The disagreement is emerging as China faces pressure on multiple trade fronts and as a series of diplomatic and economic meetings fuel anticipation of Chinese President Xi Jinping’s expected trip to Washington later this month.

Iran Sanctions Add Another U.S.-China Flashpoint

The trade dispute is also unfolding alongside a separate confrontation over U.S. sanctions related to Iran. Asked by CNBC about the latest U.S. sanctions targeting Iran, Huang called on Washington to reverse what Beijing considers unlawful measures and remove sanctions imposed on Chinese companies and citizens.

“Despite repeated requests from China, the U.S. has used Iran as an excuse for repeatedly imposing sanctions on Chinese companies and citizens, to which China is strongly dissatisfied and firmly opposes,” Huang said.

Bessent announced early last week that entities, including Chinese banks, that facilitate money laundering or sanctions evasion on behalf of Iran could be cut off from the U.S. financial system.

The threat is significant because access to the U.S.-dominated financial system remains a critical pressure point for Chinese financial institutions with international operations. Any escalation could therefore extend the bilateral dispute beyond tariffs and industrial policy into banking and cross-border finance.

France Becomes Latest Target of Beijing’s Trade Warnings

China also criticized France over a new law intended to curb the low prices charged by Chinese e-commerce companies such as Temu.

Huang urged Paris to halt implementation of the measure and warned that Beijing could retaliate if France proceeded.

“If France persists in its course of action, China will take necessary measures to safeguard the legitimate rights and interests of Chinese enterprises, and France will bear all consequences,” she said.

The warning adds another layer to the difficult relations between Beijing and European capitals. European governments have sought to reduce their dependence on China in strategic industries while simultaneously attempting to address a rapidly widening trade imbalance.

The European Union and China have been engaged in trade discussions throughout the summer, with Brussels seeking progress toward reducing its record trade deficit with Beijing by October.

EU Trade Commissioner Maroš Šef?ovi? said in an interview with Euronews this week that China would need to produce “concrete results” by October or face “harsher measures.”

Huang said China remained willing to work with the European Union but rejected what Beijing views as unilateral demands. China, she said, is prepared to cooperate with the EU, but “demands should not be made unilaterally, and threats should not be made to close markets.”

At the heart of the dispute is China’s transformation into a manufacturing and export powerhouse at a time when demand inside the country has struggled to absorb its industrial output.

Chinese manufacturers have become competitive across sectors including electric vehicles, batteries, solar equipment, machinery and consumer goods. Their ability to produce at scale and sell into overseas markets has generated significant export growth, but it has also triggered defensive measures from trading partners.

The concern is about the effect of China’s industrial model on their own manufacturing bases in the U.S. and Europe. For Beijing, restrictions on Chinese products threaten the export markets that have become an important outlet for its manufacturing sector.

That backdrop creates a difficult policy dilemma for both sides. China needs access to overseas markets as it seeks to sustain growth and support manufacturers, while its trading partners want to prevent a flood of low-priced imports from weakening domestic producers.

China’s rejection of the G20 language indicates little appetite in Beijing to accept international pressure framed around “imbalances” or “overcapacity.” At the same time, the growing number of trade restrictions and warnings from the U.S. and Europe suggests that the issue is unlikely to disappear through diplomatic negotiations alone.

The risk is that the disagreement could develop into a broader cycle of tariffs and retaliatory measures, fragmenting supply chains and making it harder for multinational companies to operate across the world’s two largest economic blocs and their major trading partners.