By Michael Hernandez</p> <p>WASHINGTON (AA) - U.S. President Donald Trump imposed sanctions on Iran's iron, steel, aluminum, and copper sectors Wednesday as tensions between the rivals escalates. </p> <p>The penalties affect what Trump called the Iranian government's "largest non-petroleum-related sources of export revenue" one year after he pulled the U.S. out of a landmark nuclear accord that placed unprecedented curbs on Tehran's nuclear program. </p> <p>Trump and his senior officials have embarked upon a wide-ranging campaign to ramp up pressure on the Iranian government in the time since, including reimposing sanctions on Iran's oil sector that were lifted as part of the 2015 agreement. </p> <p>"Tehran can expect further actions unless it fundamentally alters its conduct," the president said in a statement. "Since our exit from the Iran deal, which is broken beyond repair, the United States has put forward 12 conditions that offer the basis of a comprehensive agreement with Iran."