Your Russian is brilliant!
It depends on how you get from the Domodedovo airport to the city. Assuming that you take the
Aeroexpress train, you can buy
a combined Aeroexpress + Metro ticket for 560 rubles (for 1 Aeroexpress trip + 1 metro trip) in a ticket office at the airport. I recommend this because the lines at the ticket offices of the Paveletskaya station tend to be long and it's preferable to wait until you get to a less crowded station if you wish to buy the Troika (see below).
To move around Moscow further, you can buy
the Troika card at any metro station, top it up with several hundred rubles and use it on the metro and street transport (buses, trolleybuses, trams). It works like PayPass, you don't even need to insert it anywhere - just touch the validator with your card when you enter the metro or a vehicle.
Then the 90-minute tariff will be applied automatically on your second touch-in (then any further changes between vehicles will be free until 90 minutes elapse since the first touch-in*, the only limitation is that you'll be charged again if you enter the metro for the second time), there's no need to buy a separate ticket for it.
The tariffs section in English is outdated - the current tariff is 35 rubles for the first boarding + 19 more rubles for the second one, the third and further boardings within the 90 minutes since the first one are free as long as you don't enter the metro for the second time.
Note that the entrance into a street vehicle is strictly through the front door (except the trams of the North-West where entrance is allowed through any door as an experiment but you still have to touch any validator inside the vehicle with your card).
* It only matters that you
board before the 90 minutes end; then, even if your trip ends up taking more than 90 minutes, you won't be fined.
Last edited by coon74; 05-12-2017 at 11:10 AM.