Victor Suvorov wrote about GRU illegals 40 years ago in Aquarium. For all the shade thrown at his writing since, it sure has aged well. Here we are with bombings, poisonings, corruption and GRU agents creeping around in Europe today.

He wrote that the traditional method to deal with traitors in the GRU is the headquarters furnace: wire the "guilty" to a gurney and feed them in alive.

His writing about Soviet military doctrine is visible today in Ukraine as well. A giant horde of "mechanized infantry," badly led. They're still using some of the same armor.