Europe’s communication space is increasingly difficult to defend without closing it off. Political actors, platforms and civil society face the same underlying challenge: how do you protect an open information environment while making it more resilient to manipulation and disruption? Tomáš Halász of TrollWall and Omri Preiss of Alliance4Europe examine where Europe’s current defences fall short, what greater resilience could look like, and how we can strengthen the public sphere without building walls around it.