The Japanese yen experienced significant fluctuations against the U.S. dollar, crossing ¥155 per dollar for the first time since 1990. This volatility included a sharp swing from losses to gains, briefly surging from the upper 156 to upper 154 range before stabilizing around the 155 mark. Traders are closely monitoring these movements for potential Bank of Japan intervention, as the USD/JPY pair found support at 155 and rallied towards 156.40.