CurrenciesUncertainty over US-Iran peace talks propels dollar-buyingHigh crude prices tend to encourage yen-selling as they hurt energy-scarce Japan. (Photo by Nanami Sato)Nikkei staff writersJune 3, 2026 09:25 JSTTokyo -- The yen weakened against the dollar on Wednesday, temporarily falling below the 160 yen mark for the first time since April 30, when the Japanese government and the Bank of Japan intervened to prop up the currency.