The INR Theory Department is located in Moscow on 60th October Anniversary prospect, 7a (map)
The most convenient way to get from Moscow airports to the downtown is to take one of the express trains. The trip will take approximately 40 minutes.
The train from the Sheremetyevo airport will bring you to the train station Belorusskiy. In this case you should take metro at the station Belorusskaya. Likewise, the train from the Domodedovo airport will bring you to the train station Paveletskiy. The closest metro station in this case is Paveletskaya.
In the case you take the dark green line go to the Novokuznetskaya station (4 stops from the Belorusskaya station and 1 stop from the Paveletskaya station) and transfer to the station Tretyakovskaya of the orange line. Go 3 stops in the direction from the city center to get out at the station Leninsky prospekt.
If you take the Circular line go to the Oktyabrskaya station (4 stops from the Belorusskaya station and 2 stops from the Paveletskaya station) and transfer to the orange line. Go 2 stops in the direction from the city center and get out at the station Leninsky prospekt.
Information about Moscow metro including fares can be found here.
Important: the Leninsky prospekt station has two exits; you should take the one in the direction from the city center.
Once you are out of the station, go to the right around the station building. Descend the steps behind the building and go along the pedestrian trail slightly to the left (you'll have to go up a few steps) till you reach the Vavilova street.
Cross the street and go a bit to the right. You will see in front of you a tall green skyscraper-type building. At this moment turn to the left to a small road with a lot of parked cars and continue along it until you reach a light yellow wall with gates on your right. A small building to the left of the gates carries a brown plate and here you are: this is the territory of INR.
To enter inside you have to go through this small building with a security guard. Once you are on the territory go past a long yellow building on your left. The Theory Division building, of light blue color, is the next. The walk takes approximately 15 minutes.
Here is the map with the route from the Leninsky prospekt metro station to the Theory Division: