Reuters put USD/JPY at 162.84 on 1 July, a fresh four-decade high for the dollar against the yen and the pair's weakest reading since the mid-1980s, before the cross eased toward 162.35 as the session progressed [E1][E2].
Rising U.S. Treasury yields and a firmer dollar index near 101.28 drove the move, with Reuters reporting the 10-year yield at 4.471% as traders priced widening rate differentials against the Bank of Japan's accommodative stance [E2][E3].
Thin liquidity around the U.S. holiday amplified the session's volatility, a backdrop Reuters noted as traders watched for potential official action from Tokyo even though no confirmed intervention landed on the day [E1][E4].
Japan's finance ministry kept its intervention posture intact. Government sources told Reuters the late-April “final warning” still stood, and Chief Cabinet Secretary Katayama reiterated readiness to respond to excessive forex swings [E5][E6].
Senior currency diplomat Mimura told Bloomberg that prior intervention had been effective and that the United States had been supportive, language Reuters carried on 1 July that underscored Tokyo's coordination hopes without confirming fresh dollar sales [E7].
Carry-trade positioning and imported-energy costs remain the stakes. A weaker yen keeps yen-funded borrowing attractive for global investors while raising the yen-denominated bill for Japan's fuel imports, pressures Reuters linked to the pair's slide through late June into July [E1][E8].
Tokyo's credibility now rides on a line officials have drawn without fully enforcing. Reuters reported traders pricing intervention risk after the 162.84 print, yet the absence of verified Ministry of Finance action on 1 July left the market testing how far rhetoric alone can hold [E4][E7][E8].