Initially, the U.S. dollar strengthened against the major world currencies, but subsequently the quotations declined again. Investors are concerned about the risk of expanding conflict in the Middle East, especially in the context of possible disruptions in oil supplies. Despite the recent strengthening of the dollar, experts are not sure about the stability of this trend: much will depend on the outcome of the Fed meeting and clarification of U.S. trade policy.EUR/USD market made an attempt to overcome the resistance zone of 1.1500-1.1570, however, at the moment, quotes have returned to the range.Significant volatility should be expected in the middle of the week, when the decision of the U.S. Federal Reserve on the key rate will be known and traders will be able to hear comments and assess the expectations of the regulator.