Japan warns speculators as yen nears 160 amid escalating Iran conflict

Friday 03 April 2026 - 10:50

Japanese Finance Minister Satsuki Katayama intensified warnings to currency speculators on Friday as the yen traded near the critical level of 160 per dollar, a threshold widely regarded as a trigger for government intervention. The warning came hours after President Donald Trump's televised address to the nation on Wednesday evening, in which he pledged to strike Iran "extremely hard" within the next two to three weeks, dashing market hopes for a swift end to the conflict and sending fresh shockwaves through global markets.

Katayama, who has issued a series of increasingly firm warnings since the Iran conflict began in late February, said speculative activity was fueling sharp volatility in both crude oil futures and foreign exchange markets. "Not only the crude oil futures market, but also the foreign exchange market is becoming very speculative," the minister said earlier in the week, signaling that the government was prepared to deploy "all possible measures" to counter disorderly moves.

The yen weakened Thursday following Trump's address but held above the 160 threshold, trading around 159.25 per dollar according to CNBC. The currency had briefly breached 160 on March 30, reaching 160.46 — its weakest level since July 2024 — before warnings of intervention from Vice Finance Minister for International Affairs Atsushi Mimura pushed it back. Mimura's use of the phrase "decisive measures" represented the strongest language since he took office in 2024, according to Jiji Press.

Japan has well-established experience with verbal intervention strategy. Tokyo spent approximately $62 billion defending the yen in 2024 when it crossed the 160 level, and traders are closely monitoring official language for signs that rhetoric could again give way to action. The widening interest rate gap between the Bank of Japan's policy rate of 0.75 percent and the Federal Reserve's range of 3.50 to 3.75 percent continues to weigh on the yen, while Japan's heavy dependence on Middle Eastern energy imports — roughly 90 percent of its oil — amplifies the currency's vulnerability to the conflict.

Trump's address reverberated well beyond currency markets. Asian equities reversed earlier gains, with South Korea's Kospi falling 5.5 percent and Japan's Nikkei 225 posting a sharp decline. Crude oil surged, with WTI futures jumping more than $6 to exceed $100 per barrel. The dollar strengthened broadly as investors moved into safe-haven assets.

Teppei Ino, head of global markets research at MUFG Bank in Tokyo, warned that verbal warnings alone may not be sufficient. "We need to remain aware that the yen could weaken again beyond 160 against the dollar," he said, adding that official statements are "unlikely to significantly change market sentiment."