Recent disputes between Poland, Hungary and EU institutions have reignited questions about the future of both countries’ membership in the continental bloc. The evolution of these disputes is relevant for the future of the European Union because pervasive nationalist sentiments in Europe mean that the prospect of additional countries moving away from the idea of pan-European federalism and resorting to sovereignist positions is a real possibility. This would further weaken the European Union’s internal cohesion, make its decision-making process even more complex and reduce its geopolitical clout. ...