How did Israeli intelligence reach Hezbollah's top leaders?
Recruiting spies has been the oldest method for penetrating military intelligence.
Yet, Hezbollah has maintained a secretive operational profile for decades, mainly through its Preventive Security Unit, which acts as a shield for Hezbollah's military and security information.
This unit investigates any infiltration attempts, both human and technological. Yet even the head of this unit, Sheikh Nabil Qaouk, fell victim to an Israeli assassination within his own residence.
While a human breach can occur, the nature of these assassinations necessitates highly detailed information that a mere informant might not provide.
For example, targeting Nasrallah would demand pinpoint data on the meeting time, location, the depth of his secure facility, reinforced concrete structures protecting it, and blueprints of emergency exits.