I myself is an unfortunate owner of a russian passport, and my spend childhood there.
> The police there don’t mess around, are very violent
Of course! That's rather obvious. You will not be able to resist any much bigger force than just police with puny handguns you can buy on the black market, but that's the point!
Have that militarised special police busy! Have them expending resources, have them running armour around cities at a great material cost. Not to say disruption of everyday life, and seeing armour on the streets will contribute greatly to galvanising the population, and demoralising the ordinary police.
Simple math tells that 1 million men strong police force will quickly exhaust itself being either split on 100+ major cities, or being constantly relocated from one city, to another.
The ratio of military age men, to police force in Russia is 21 to 1, and you very much expect that a bigger portion of population has to be counted, and not all mancount of police, and 3 letter services account for military like units.