The Office of the U.S. Trade Representative this week welcomed as a major trade enforcement victory China’s announcement that it has eliminated export duties on rare earth minerals, tungsten and molybdenum, but vowed to monitor closely if China fully complies with an underlying World Trade Organization ruling. “We’ve shown once again that vigorous trade enforcement can and does produce real results,” USTR Michael Froman said in a May 4 statement. “We will be closely monitoring China’s actions to ensure that...