for formatting a book with Russian text I am in search for a font widely used. Currently, I am using Tahoma but it misses quite some options (e.g. italic, semi bold). Could anybody point me to the right font and where I could obtain it if it is not already in id6?
There's loads of great, classic fonts with Cyrillic: Minion Pro,
Garamond Premier Pro, Palatino Linotype, Arno Pro, Times New Roman
... to name just a few.
Use an OTF font with Pro or World in its name, several Pro fonts are included in the TypeKit which comes with CC.