Not heard of this before it popped up on another forum was around then and in my 20s
Basically in 1986 muslim extremists kidnapped 4 Russian Diplomats and demanded that they pressure Syria to stop bombing muslim positions in Tripoli.
After they killed the first hostage its reported the KGB cut off a relative of the kidnappers meat and vedge then shot him sending the bits to the kidnappers demanding their immediate release or expect more packages. The hostages were released 4 weeks after being taken.
Hostages? No Problem Soviets Offer 'How-to' Lesson In Kidnapping - philly-archives
unsure if its true or propaganda but it worked for a long while.