According to online reports, according to foreign media reports, the U.S. dollar is expected to record its largest one-day gain in a month on Friday as investors repurchased the U.S. dollar after Israel launched an attack on Iran, triggering retaliation from Iran. At first, the safe-haven currencies, the Swiss franc and the Japanese yen, rose, but were later recovered by the US dollar. The dollar has always been the ultimate safe haven in times of geopolitical or financial turmoil. The U.S. dollar rose nearly 0.9% against a basket of major currencies, with the euro, pound and Australian dollar falling particularly significantly. The US dollar index rose 0.85%, on track to record its largest one-day gain since May 12. City Index strategist Fiona Cincotta said the dollar is returning to its traditional safe-haven role, but if the situation relaxes over the weekend, the boost may not last long.