Officials say Iran’s retaliatory attacks in the Middle East over strikes from Israel and the U.S. have left some of America’s partners in the Gulf frustrated over a lack of notice or adequate defense. The mostly private frustration comes as Pentagon officials conceded this week they’re struggling to stop waves of drones launched by Iran, leaving some U.S. targets in the Gulf region vulnerable. The Gulf countries have emerged as targets for Iran, well within the range of Iran’s short-range missiles and filled with targets, including American troops, businesses, tourist locations and energy facilities. The officials spoke on the condition of anonymity because they were discussing a confidential diplomatic matter.