Due to their asymmetric and networked nature, terrorist organisations challenge states in their ability to respond to the threat within and beyond their borders, increasing the pressure for cooperative behaviour. Cross-border security initiatives has skyrocket worldwide, granting to borders a new relevance as geo-graphical spaces for counterterrorism cooperation. Yet, no systematic data is available to analyze how cross-border cooperation works in practice. How are European actors – EU and beyond- cooperating cross-border? What practices, initiatives and measures have implemented and among who?

• (counter)terrorism
• civil war
• military interventions
• security and threat