But details of what a drone wall would comprise remain scant, and there is much skepticism, including from within the EU, about the feasibility of the ambitious idea. Creating a comprehensive drone defence system across such a vast border is replete with challenges. Story continues below this adSpeaking at the Warsaw Security Forum on Monday, Germany Defence Minister Boris Pistorius argued that the plans to build a drone wall are a misguided use of finite resources. “National budgets are the pillars of EU defence. As things stand, a drone wall is an ambitious, some might say necessary, project.