A new poll shows an increase in popularity across the board for state security careers, but it may not all be down to the job itself.
Whatever the historical context, most of the Kremlin's agents "have always been true servants of the state and patriots," the former KGB officer said.
Russia's security service posted images and video of an apartment they said served as a "laboratory" of arms for the detained extremists.
Russia annexed Crimea in 2014 with lofty tourism targets, but bookings for 2017 are reportedly down 30 percent.
The Kremlin confirmed Yevgeny Zynychev had left Kaliningrad for personal reasons.
Shots and two explosions were reported in St Petersburg Wednesday morning.
Kiev says FSB agents and Russian armed forces shot at each other.
Russia's intelligence service doesn't attribute blame for the widespread attack targeting government agencies, defense companies.
Authorities suspect the centers of illegal business activity.
The FSB reported having arrested seven ISIS affiliates who were planning to attack Moscow and St. Petersburg.
The verdict on the Litvinenko murder case could strain relations between London and Moscow.