On June 9, the United Nations Security Council voted to approve sanctions that target Iran's defense and nuclear industry. But the Security Council resolution does not list defensive weapons, such as air defense systems, as part of the UN ban on Tehran.Specifically, the sanctions do not block Iran's efforts to acquire the S-300PMU1 air defense system from Russia. "This resolution will put in place the toughest sanctions ever faced by the Iranian government, and it sends an unmistakable message about the international community's commitment to stopping the spread of nuclear weapons," U.S. President Barack Obama said. Officials said UN members...