In Moscow, facial-recognition cameras are playing a key role in combatting the coronavirus. The city rolled out the technology just before the epidemic, ignoring concerns over such sophisticated state surveillance.
Since last month, thousands of Muscovites have been confined to their flats for 14 days of compulsory quarantine after travelling to virus-hit countries, contacting those infected or being diagnosed with mild symptoms.
Police log their details and warn them that sneaking out in the city of 16 million could lead to a five-year jail term or deportation for foreigners.
The city already had a tight network of 170,000 security cameras set up in streets and metro stations over the past decade.
Around 100,000 of these are now linked up to artificial intelligence systems that can identify people being filmed. The rest will follow shortly.