Yandex, which runs Russia's most popular search engine and email service, among other things, did not refute the reports, saying merely that concerns over national security should not infringe on user privacy.
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Russia has adopted a flurry of laws in recent years expanding the government's control over the internet.
One of the laws gave officials, including the FSB, a adult dating novi michigan hand in requesting user data from internet companies.
Yandex's statement came a day after the Russian communications regulator said that it is now requiring dating app Tinder to hand over data on its users.