This is the final installment of our four-part Target USA series "Anatomy of a Russian Attack on the U.S." In this episode, Robert Cardillo, director of the National Geospatial-Intelligence Agency, details how Russia's activities have impacted the U.S. intelligence community. Also, Rod Rosenstein, deputy attorney general at the Justice Department, discusses how they are going to deal with Russia's efforts. And also, a former Russian spy tells us what we should expect in the coming weeks, months and years. As we've told you, the U.S. intelligence community concluded that Russian President Vladimir Putin ordered operatives to interfere in the 2016 presidential election. A Target USA investigation that began in November 2016 examined how the attack happened, when it started, who was involved and what will lie ahead. We conducted dozens of interviews, in the U.S. and abroad, with current and former U.S. intelligence officials, members of Congress, cyber security and intelligence experts, foreign government officials, Russian nationals and American victims.