Serbia is a candidate for European Union membership and Hungary has been a full member since 2004, but that hasn’t prevented them from collaborating with Russia to undermine EU cohesion and meddle with efforts to break Europe’s dependency on Russian energy. Ukrainian drones, however, have succeeded in disrupting Belgrade’s and Budapest’s designs. EU Commissioner for Energy Dan Jørgensen unveiled an ambitious plan in June to stop all Russian oil and natural gas exports to the European Union by 2027. A little over one…