In the long contest between open societies and the instruments of covert power, a drone discovered near a Ukrainian transport aircraft at Leipzig/Halle Airport on August 4 has become the latest emblem of Russia's hybrid campaign against European solidarity with Ukraine. German investigators, tracing explosives smuggled through the Balkans and DNA evidence linking the device to a prior arson, have attributed the failed attack to the GRU — Moscow's military intelligence service. The episode raises a question older than any single incident: how does a known adversary move freely through a watchfu