Yes, you should be able to do what you ask. It will definitely do English to Russian. I don't have any Russian ebooks to test, but the dictionary to give an English definition to a Russian word is there.
The dictionaries available on the jetbook are:
I did test the Spanish to English dictionary on one of the Spanish books that came with the Jetbook and it worked fine without having to leave the book.
Last edited by thenitch; 02-12-2010 at 02:57 AM.