The European Union on Tuesday announced its strongest round of sanctions against Russia since the beginning of the Ukraine crisis. The sanctions are meant to show Moscow that the Europeans are willing to punish Russia for supporting the rebellion in eastern Ukraine. But they are also meant to contain political fragmentation within the European Union at a time when countries in Central and Eastern Europe are becoming increasingly uncomfortable with what they perceive as a lack of action from the bloc's largest economies. A few hours after the announcement, the United States also adopted additional sanctions against Russia. Europe's sanctions prohibit state-owned Russian banks from buying or selling bonds and equity in the European Union, place an embargo on new arms sales, prohibit exports of dual use goods (software and technology that can be used for both civilian and military purposes) to Russia and restrict the export of certain energy-related...