Sergei was uncomfortably close. Literally so. Not only was Andrea repelled by his roving gaze, but the fumes from whatever he had been drinking burned her eyes. She couldn't tell if he thought that he was charming, or knew how odious he was and relished in making her feel uncomfortable.
Either way, she wasn't about to give him the satisfaction. He actually reminded her of some of the men she had met professionally, who thought women were fragile delicate creatures who would collapse into a quivering mess in the face of their display of dominance. They wanted to make you scared, and giving them what they wanted only encouraged them. You had to stand up tall and show that you weren't going to be intimidated.
