The death in Spain of Maksim Kuzminov, a pilot who delivered a helicopter and secret documents to Ukraine, has raised fears that the Kremlin is again targeting its enemies.
Author: Michael Schwirtz and José Bautista
Married Kremlin Spies, a Shadowy Mission to Moscow and Unrest in Catalonia
Intelligence files suggest an aide to a top Catalan separatist sought help from Russia in the struggle to break with Spain. A fierce new protest group emerged shortly afterward.