Russia is not amused. Moscow on Thursday blasted the European Union’s plan to permanently ban Russian oil imports, with Foreign Ministry spokeswoman Maria Zakharova calling the proposal madness and suggesting only a “madman” would even float the idea. The language was vintage Kremlin — theatrical, indignant, and aimed as much at European voters as at Brussels policymakers. The European Commission is preparing to submit a legal proposal on April 15 to make the ban permanent, according to EU officials and a document seen by…