The papers spent years hidden in a milk churn beneath a Russian dacha and read like an encyclopedia of Cold War espionage.

Original documents from one of the biggest intelligence leaks in history — a who's who of Soviet spying — were released Monday after being held in secret for two decades.

The files smuggled out of Russia in 1992 by senior KGB official Vasili Mitrokhin describe sabotage plots, booby-trapped weapons caches and armies of agents under cover in the West — the real-life inspiration for the fictional Soviet moles in "The Americans" TV series.