I also need Tails to support the Russian encoding - how can I set so?

If you mean that you need to switch your keyboard to the Russian layout you can do that from the menu System → Preferences → Keyboard → Layouts → Add…. This will add a little widget in the top-left area of the screen to switch between the different keyboard layouts that you added.

Comment by Tails Tue 01 Nov 2011 10:40:11 AM CET