Japan PM Takaichi vows yen defense as USD/JPY nears 160 again

Japan's Prime Minister Sanae Takaichi said Friday the government will defend the yen's credibility by strengthening the economy, as the currency slid back to near 160 against the dollar despite a record $73 billion intervention campaign.

"The economic and fiscal management I am pursuing is not intended to steer foreign-exchange rates," Takaichi told parliament. She said policies to increase domestic investment, reinforce supply chains and boost growth potential would "help maintain confidence in the yen." Finance Minister Satsuki Katayama separately confirmed the government stands ready for "appropriate action" in the forex market, emphasizing close communication with U.S. authorities.

The dollar bought 159.97 yen Friday, within striking distance of the 160 threshold widely seen as a trigger for further intervention. Japan spent more than $73 billion supporting the currency between April 28 and May 27 — its first intervention since 2024 — as officials grew alarmed about import-driven inflation in food and energy. The intervention spending exceeded the $62 billion deployed during the October-December 2022 campaign, making it Japan's largest ever in dollar terms.

The persistent weakness fuels expectations of a Bank of Japan rate hike, yet rate differentials and dollar resilience continue to overwhelm official efforts. "That tells us that while BOJ tightening risk is rising, rate differentials and dollar resilience remain powerful offsets," said Patrick Munnelly, market analyst at Tickmill Group. "Intervention risk has not disappeared."

Intervention's Diminishing Returns

Japan's latest foray into currency markets failed to establish a durable floor under the yen. The previous intervention in 2022 bought roughly six months of relative stability above 145 before renewed pressure emerged. This time, the yen weakened back to intervention levels within weeks, reflecting a structural shift in Japan's external position. The country's current account surplus has narrowed as energy import costs surged amid Middle East tensions, reducing the natural demand for yen that historically capped depreciation. Meanwhile, the Bank of Japan's policy rate at 0.5% remains far below the Federal Reserve's 4.25-4.50% range, keeping the carry trade overwhelmingly in favor of dollar longs. The interest rate differential of nearly 400 basis points means that even a 25-basis-point BOJ hike would do little to close the gap.

Treasury Sales Create a Feedback Loop

To fund its intervention, Japan has been selling U.S. Treasuries, adding to broader global dollar asset liquidation. Japan sold roughly $76 billion of Treasuries since the start of 2026, reducing its holdings to $1.19 trillion, according to market reports. The selling has contributed to upward pressure on U.S. yields, with the 10-year Treasury yielding 4.55% and the 30-year long bond at 5.09%. The dynamic creates a self-reinforcing loop: yen weakness forces intervention, which requires Treasury sales, which pushes U.S. yields higher, which widens the rate differential and further weakens the yen. The last time Japan faced a similar bind was in late 2022, when the MOF intervened at 151.94 and the yen eventually strengthened to 127 by early 2023 — a recovery that required the BOJ to widen its yield curve control band and the Fed to signal a pause.

The next catalyst for yen direction is the BOJ's policy meeting later this month. Markets are pricing roughly 40% probability of a 25-basis-point rate increase, according to overnight index swaps. A hike would narrow the rate differential by a modest margin but would need to be accompanied by hawkish forward guidance to meaningfully shift the carry trade calculus. Without that, the 160 level remains vulnerable, and another intervention round — potentially larger than the $73 billion already spent — may be the only tool left. The broader geopolitical backdrop, including ongoing Middle East tensions that have pushed oil prices higher and strengthened the dollar's safe-haven appeal, adds another layer of headwind for Japanese policymakers.

This article is for informational purposes only and does not constitute investment advice.