Within a short period of time, the MI6 launched a secret operation in which Mitrokhin and his family were smuggled to Britain. They landed in the country along with the KGB’s top secrets: tens of thousands of documents that Mitrokhin had copied and hidden in milk barrels and other containers in the floor of his two dachas, one of them in the suburbs of Moscow. Only a few people in Britain—led by then-Prime Minister John Major, who personally approved the operation—were aware of the package that had landed in their country that day.
This took place in 1992. Intelligence experts began analyzing the documents immediately and uncovered more and more revelations from Mitrokhin’s milk barrels. They included the wiretapping of former US Secretary of State Henry Kissinger’s phone, stolen US nuclear secrets, and the deep and incredible infiltration of Germany and France’s political leadership.
As a result of these documents, KGB agents were apprehended all over the world, secret operation methods were exposed, and espionage operations—some dating back many years—were thwarted. The impact in Britain, the United States, and countries across Europe was immediate. The intelligence tumult that broke out affected Israel as well, but most of Mitrokhin’s documents about the KGB’s extensive activity in Israel have never been published. Until now.
Source: Ynetnews News – The KGB’s Middle East Files: Leaking thousands of documents – 10/28/2016.