Ukraine urgently wants cash. Brussels subsequently needs to provide the nation a 90 billion euro mortgage to purchase weapons. It might be financed with shared debt – and will trigger disputes among the many EU states. Or with the Americans.
https://www.welt.de/wirtschaft/plus69679df59f36d5bf769fb7ed/eu-gemeinsame-schulden-fuer-die-ukraine-so-riskant-ist-bruessels-plan-b.html