I live in Moscow, Russia, and there was a brief time when I was stripped of rights to enter a restaurant, cafe, gym, theater, concert or sports venue. There was talking about requirement of vaccination to use public transit and even a taxi.

Fortunately, those restrictions were cancelled after 3 weeks, because you know, voting day is coming and we don't need angry citizens to vote against ruling party. But the infrastructure is there and it may be used again any time now.