China and the European Union on Tuesday agreed to “fight against unilateralism and protectionism” and “commit to complying” with the rules set by the World Trade Organization. They also pledged to work on strengthening rules on industrial subsidies. A joint statement released by Chinese President Xi Jinping, European Commission President Jean-Clause Juncker, and European Council President Donald Tusk covered many issues for which the Trump administration has pilloried Beijing, which are at the heart of ongoing U.S.-China negotiations. For instance,...