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The U.S. dollar surged against major currencies as failed U.S.-Iran peace talks heightened geopolitical tensions, triggering a flight to safety in traditional safe-haven assets. The greenback gained 0.8% against the euro and 1.2% against the yen, with traders citing increased demand for dollar-denominated assets amid rising regional instability. Gold prices also rose 0.6% as investors sought refuge from market volatility. The breakdown in negotiations, which had aimed to revive the 2015 nuclear deal, has raised concerns about renewed sanctions and potential military escalation in the Middle East.

For forex markets, the dollar's strength reflects broader risk-off sentiment, with the U.S. currency often acting as a proxy for safe-haven demand during geopolitical crises. Traders are now closely monitoring central bank policy statements and upcoming U.S. economic data to gauge whether the dollar's rally will persist. The yen and Swiss franc also benefited from the risk-off environment, while emerging market currencies faced downward pressure.

Looking ahead, investors should watch for further developments in U.S.-Iran relations, including potential sanctions or diplomatic overtures. Energy markets remain a key wildcard, as any escalation in the Middle East could disrupt oil supplies and drive up prices. The Federal Reserve's response to shifting risk perceptions will also be critical in determining the dollar's trajectory in the coming weeks.