My reading has been mostly centred around Ukraine, Russia and totalitarianism recently.
Bloodlands by Timothy Snyder. Brutal account of the atrocities on the eastern front in WWII and the preceding period.
Between East and West by Anne Applebaum. Great insight into the people and history in...
I've got his book on the international brigade in the civil war too but haven't got around to reading it yet. His newspaper articles on Spain are usually worth a read too.