Bullski is a former Russian super-soldier who absconded from the country with his powered armor and now makes a living as a super-powered mercenary. He has always fashioned himself as a rival to Iron Man and is constantly upgrading his armor as he acquires the funds and technology to do so.
He was last seen working with Hydra, assisting in their daring raid on Stark Tower. He fought Iron Man to a draw, eluding pursuit by sinking a rescue boat ferrying Stark employees back to Manhattan. (Assembly Required #1)