Weapons: Scoped .44 Magnum
Dukov is a Russian drunk who can be found at Dukov's Place in the Capital Wasteland. He was a former mercenary and was part of the crew hired by Allistair Tenpenny to search Fort Constantine for a special weapon. Now he's retired and spends all his time drinking and taking Jet with his two prostitutes Cherry and Fantasia.
Dukoc has a special key on him that is required for the You Gotta Shoot 'Em in the Head quest. You can get the key by killing him, completing a Speech check or by starting the unmarked quest; Cherry's Freedom.