E katerina Fedun is a Russian heiress to the fortune of her father, Leonid Fedun, a powerful Russian oil oligarch who was a key executive and one of the largest shareholders of Lukoil, Russia's second-largest oil company. Her father was a high-ranking military officer and professor before becoming a crucial partner to Vagit Alekperov in the creation and growth of Lukoil during the post-Soviet era.

Ekaterina's immense wealth is derived from her father's massive stake in the oil giant, a portion of which he has transferred to her and her brother, Anton. While her father was the architect of the family's fortune, and her brother is involved in the family's hotel business, Ekaterina is not known to be involved in the family's core business interests. Her wealth is a direct result of her inherited stake in one of Russia's most valuable and powerful natural resource companies.