U.S. stocks are increasingly vulnerable to a significant downturn this year due to the intensifying conflict in Iran, according to veteran strategist Ed Yardeni. Bloomberg posted on X, highlighting Yardeni's updated perspective on the rapidly changing global market conditions. Yardeni emphasized the potential impact of geopolitical tensions on financial markets, suggesting that investors should brace for heightened volatility. The strategist's warning comes as the situation in Iran continues to evolve, posing challenges for global economic stability. Yardeni's analysis reflects concerns about the broader implications of the conflict on international trade and investment, which could lead to a sharp selloff in U.S. equities. As the year progresses, market participants are advised to remain vigilant and consider the geopolitical landscape in their investment strategies.