In this episode, Ruslan Denisov is a Russian-speaking individual who gets involved in a storyline with main character Mike Ehrmantraut. The episode revolves around Mike's actions as a private investigator and his interactions with Ruslan.
If you're referring to the popular TV show "Better Call Saul" or another show, Ruslan Denisov is a character that appears in Season 2, Episode 11. Here's some general information about the episode and character: [S2E11] Ruslan Denisov
Unfortunately, without more context, I couldn't find much information on Ruslan Denisov's background. If you could provide more details about the show or clarify which Ruslan Denisov you're interested in, I'd be happy to try and provide more information. In this episode, Ruslan Denisov is a Russian-speaking