Looking for info on Russian avionics

Dear sir/madam,
I am interested in finding out about Russian avionics and radars, and I would like to know:
1. How do russian avonics and radars compare to those in the west?
2. Which russian aircraft has the best, or is likely to have the best avionics?
3. Are there any russian avionics and radars that are better than wester ones?
4. If you are not sure of the above, then perhaps you can direct me to a website, where I may be more likely to answers?

Thanks