The Future Combat Air System (FCAS), a joint project by France, Germany, and Spain, faces uncertainty as Germany accuses French manufacturer Dassault of blocking progress. The project, aimed at developing a sixth-generation fighter aircraft and costing at least €100 billion, is crucial for European defense. Tensions arise as Germany considers alternatives, including the Tempest project and increasing purchases of American F-35s, which could impact Franco-German relations and European sovereignty. Recent meetings between leaders reaffirm commitment but suggest possible adjustments.