On Monday's episode of 'The Late Show,' Stephen Colbert made his on-air return after coming back from Russia. Colbert promised his viewers a week's worth of Russia content but he also revealed that he was followed during his visit. "You know who did know I was in Russia? Russian intelligence. Hardcore fans, evidently — followed me everywhere," Colbert said. "Late Night with Stephen Colbert" airs weeknights at 11:35 on Global.