The war in the Middle East has caused serious disruption to the economies of frontline countries, and is dimming the outlook for many economies that had just started to recover from previous crises, the International Monetary Fund warned on Monday. In a blog published by the global lender's top economists, the IMF said the war launched by U.S. and Israeli strikes against Iran on February 28 was causing a global, but asymmetric shock and leading to tighter financial conditions.