That is a complex problem. The old school of prejudices against Russian built planes are proving very hard to overcome so most Western airlines (and many from elsewhere) stay loyal to Boeing and Airbus planes. Even though the newer Russian planes are of better quality and have higher technology than the older ones their engines remain singularly problematic - while the mating of Western engines with Russian frames (as on TU
-204) overcomes this somewhat it does not erase the views of Russian planes held by some.
The other part of the equation is that Aeroflot, which is the best-financed Russian carrier, has been introducing many Western planes into its fleet. On the one hand this is to present a more acceptable image to moneyed customers in Western destinations and, on the other, because securing deliveries of Russian planes has been very difficult in recent years. They have only ever received 6 of the 12 IL96-300s they ordered some 15 years ago! Many of the CIS airlines (and virtually all Eastern European ones) have also gone Western in recent years. The many smaller Russian domestic carriers do not have the finance to buy the newer (and thus more expensive) planes so they stay with the old, noisy and smoky types from the 60s and 70s.
For all of those reasons, the new Russian planes have found few buyers. It is a great pity though.