Ivan is a Russian hacker.
He had caused chaos within the Russian economy because of a personal vendetta. He had previously stolen 5 milllion dollars from one of Raymond Reddington's accounts.
He was initially believed to be the person behind the theft of the NSA's Skeleton Key project. However, he later convinced Raymond Reddington that someone else was using his cyber identity. He also returned Red's 5 million dollars with an additional 3 million dollars in interest. It is discovered that Harrison Lee is responsible.