Last Thursday in Brussels, Viktor Orbán once again blocked the 90 billion euros in aid for Ukraine approved by the European Council in December. Using the Druzhba pipeline as leverage, Orbán claims Ukraine is responsible for repair delays following Russian attacks, turning energy infrastructure into a tool for institutional obstruction. This article argues that this behavior represents a 'fifth corrosion' of international law: a process where member states occupy European institutions from within to neutralize them, mirroring the transactional logic of the Kremlin and undermining the EU's role as a normative guarantor. With Hungarian elections approaching on April 12, the outcome will determine whether this internal erosion of democratic and international standards continues to paralyze the Union.