Unless you have Russian citizenship ad fluent Russian then forget it. If you meet that criteria then changing your Licence should not be a problem. Also don't forget the COMPULSORY MILITARY SERVICE for one year. Unless you do that as well you won't get anywhere.
Large companies like S7 and Aeroflot are absolutely safe. The pilots who have to fly crap equipment are the ones who don't speak English. Eg most air force pilots.
If you can meet all the criteria the flying is great and there are heaps of opportunities. There is a huge shortage of pilots.