Alexander Lepenski

Alexander Lepenski was the name of a man working for Victor Drazen, posing as an informant during Operation Nightfall.

Nightfall
David and Anna Petrovic were taking Jack Bauer and his team to see their contact. As the siblings left their vehicle once they arrived at the meeting point, it was shot with a rocket launcher, injuring Ronnie Pope. Also, David Petrovic was killed by some of Victor Drazen's men.

Alexander Lepenski, posing as the Petrovic's informant (named Jovan Tesla) held Jack Bauer at gunpoint as he asked why they were there. Once he revealed his name, Anna said that he was the man her brother was meeting with, and they took him on to Drazen's compound. When it was revealed that he was in fact Alexander Lepenski, not Jovan Tesla, Anna, who was working for Drazen, shot and killed the imposter.

It is unknown what happened to the real Jovan Tesla, or whether he is alive or not.