The EU has a spy problem — here's why it's so difficult to catch them

Faced with Russian hostility and Chinese snooping, Belgium has upped its counterintelligence game — but Brussels remains a spies’ playground.

By Barbara Moens

Brussels, as nearly everyone knows, is packed with spies.

They’re hovering at the bar at the think tank networking event. They’re raising their hand in the press room at European Union briefings.

They…