Russian just means titty fucking her.  Dont make it to complicated, just do it.....

as she squeezes her breasts together. Only way to give them a proper fucking. When done properly the sensation is very close to good old fashioned bareback. Preferably with non-enhanced breasts of adequate size. This is one activitiy where too much firmness is *not* a plus. When you unload, you can give her a pearl necklace.... I always found a choker length of pearls to be a stunning addition to madame's wardrobe.... '

The most common is for her to be on her back and you straddling her breasts as she squeezes them together and you slide your cock back and forth between them. This ends in the classic "pearl necklace" experience of song.

A variation of that is to rub the tip of your cock against her (hopefully) erect nipple and coming right against it.  The gal should be warned that this could very likely result in copious amount of cum splatter, some of which is likely to end up on her face.  Some gals like that anyways and I just love to watch that happen.  This is my personal fav.

Both of these methods can also be performed with you on your back and her above.  This position allows you to do the squeezing should you like so that you can adjust the pressure to your personal preference.  You can also do the nipple splatter and given the position, the likelyhood is that the cum will land on you rather than your parner's face.  (Though is depends on your aim, trajectory, and ejaculation pressure.)

These postions can also be done in the reverse as well.

There are other variations where she can lie down on a table and you can stand astride of her (a massage parlor favorite) and even side by side laying down.

Also remember, a little massage oil applied to the breasts beforehand can really increase the pleasure.

Enjoy the full symphony of positions as long as she is willing and you have the capacity.