The SVR, Russia's Foreign Intelligence Service, headed by Naryshkin and descended from the old KGB's foreign-spying arm.
It's the cautious, by-the-book branch of Russian intelligence that focuses on classic espionage rather than blowing things up.
It runs a program of 'illegals' — agents living undercover abroad — and its hacking team, known as Cozy Bear or APT29, slipped malicious code into the widely-used SolarWinds software to spy through the companies that installed it.
It shows there are two very different styles of Russian spying: the SVR's patient, traditional approach versus the GRU's more violent sabotage.