President Volodymyr Zelensky’s anticorruption policies have already provoked Ukraine’s first antigovernment protests since the Russian invasion in 2022. Now, it seems, they may cost the country a portion of its foreign aid from the European Union, in a clear rebuke from the bloc, once a staunch ally. The European Union said on Friday that it would withhold 1.5 billion euros, or $1.7 billion, from an overall fund of 4.5 billion euros whose disbursement is dependent on achieving good governance standards and that can’t be used for military purchases. The decision is not final, however, and the funding can be restored...