CCCP/USSR books

Do you have any suggestions for books regarding USSR history, specifically for the european continent and mainland Russia?
Anything worth reading is appreciated, but it would be appreciated if some sort of priority is mentioned.

Preferbly in english, since my russian isn't particularly good yet. But I'm learning, so if you know some must-have's, please list them too.

The Archipelago is on the list already.
Thanks in advance.