Temedar thank you for your reply. I tried to do (quoting according to google translate) the following:
''Without recourse to the salon shop MTS or sales office''
but google translate is showing also (as one of steps):
"type on your mobile phone;
use the Internet Assistant;
contact the contact center MTS.
Use the switch (requires authorization in the Personal Area) "
Im not sure about Internet Assistant. I have USB key and i was told from the seller that usb key contains sim card on it. However the procedure involves contacting MTS center. I did this multiple times on two different phone numbers but noone speaks english there. They just forwarded me to some other department but noone picked up the call there. Is it possible to do international roaming service for russian sim card (to be used in ''our'' county - also in Europe) without contacting MTS? Google translate seems to do acceptable ''job'' but im afraid only those instructions you provided won't help.