 Poltava was the first Russian battleship to use Krupp cemented armor, from Germany. Her waterline armor belt was 10 – 14.5 inches (254 – 368 mm) thick. The Krupp armor of her main gun turrets had a maximum thickness of 10 inches (254 mm) and her secondary gun turrets were protected by 5 inches (127 mm) of armor. The nickel steel armor of her protective decks ranged from 2 to 3 inches (51 to 76 mm) in thickness and the sides of her conning tower were 9 inches (229 mm) thick.
