Pakistan’s leaders are playing a big role on the global stage, traveling around the world to try to broker peace between the United States and Iran. But while it plays peacemaker, Pakistan remains locked in a conflict of its own, battling its neighbor, Afghanistan, with no end in sight. Since Pakistan declared an “open war” on Afghanistan in late February, the two countries have been clashing regularly, despite efforts by China to resolve the dispute by sending an envoy to both capitals and hosting talks last month. As the violence…