Not sure if you've seen these articles....they break down the Russian Hook.

Igor Vovchanchyn: Russian Hooks ~ Fights Gone By: Classic Fights and Finishes

Analyzing Fedor: The Striking Of The Emperor - Bloody Elbow


Here's one on Igor's backstep punching.

Igor Vovchanchyn: Back-Step Punching ~ Fights Gone By: Classic Fights and Finishes

Hope that helps