In the city of Voronezh in southwest Russia, security forces handed call-up papers to 50 Azerbaijani men with dual Russian citizenship as they celebrated a birthday in a restaurant, according to local news site Vesti Voronezh.
Police reportedly raided the restaurant on Tuesday evening, demanding to see the personal documents of each guest before issuing most of those present with call-up papers.
Last month, riot police rounded up worshippers at a mosque near Moscow and took them to a military conscription office the same day.
Alexander Bastrykin, the head of Russia’s Investigative Committee, which investigates serious crimes, had previously suggested stripping recently naturalised Russians of their citizenship if they refused to fight in Ukraine.
In September, British intelligence reported that Russia had actively been recruiting Central Asian migrants to fight in Ukraine since at least May.