Grand Theft Auto 4 Episode 5: Uncle Vlad

"Vlad tells Niko that Ivan Bytchkov has upset Mikhail Faustin, his boss, and wants Niko to kill him."
"Niko finds Roman drinking at the cab depot, apparently he is depressed because he has just found out that Mallorie is having an affair with Vlad. Niko decides to take matters at his own hand and go personally talk to Vlad about the affair."