Interesting spy story

Here is a quote:

In October 1985, The Washington Post ran a story that described Tolkachev as “one of CIA’s most valuable human assets in the Soviet Union.” According to FBI affidavits related to the Howard espionage case that were made public, Tolkachev had provided information on Soviet avionics, cruise missiles, and other technologies. The Soviets subsequently publicly confirmed that they had executed Tolkachev in 1986 for “high treason.”

Tolkachev, A Worthy Successor to Penkovsky