General Viktor Zhukov was a KGB officer and head of Directorate S.

Zhukov was involved in Elizabeth's training and she saw him as a surrogte father.  He was also Claudia's lover.

He was killed by the CIA in a retribution for the Soviet-caused deaths of several FBI agents and a US scientist. Claudia encouraged Elizabeth to avenge his death by assassinating the CIA agent who ordered the killings; however Claudia eventually carried this out herself.