There was a story about some Russian IT company that got huge amounts of money for bogus claims. Maybe this is the case here, however I doubt that the FSB is th

There was a story about some Russian IT company that got huge amounts of money for bogus claims. Maybe this is the case here, however I doubt that the FSB is that incompetent. Or it's an attempt to deter usage of WhatsApp and other clients. On the other hand there were rumours that Russia can and does manipulate SS7 e.g. to get 2FA tokens via SMS, they also have likely control over the GSM and 3G/4G stations. As this is a black box it's probably not impossible that a network operator could access the keys via the baseband if there is a hole a "feature" e.g. for DMA access from the baseband to the phone, however this is pure speculation from my part.