This is according to former KGB spy Yuri Shvets who defected to the US in 1993.
What this says to me is, former spy whose knowledge of the Russian security state became outdated decades ago is desperately spewing bullshit in order to create the illusion they’re still useful.
The counterfactual here is even funnier, collapsing nation russia in 1993 somehow managed to develop illness-giving-untraceable-energy-weapons and then just didn't use any of them for a good 30 years