A billionaire built Russia’s mayonnaise empire, then bankrolled its battlefield drones. Now Valery Kustov is under arrest on major fraud charges.

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MOSCOW, July 30 - Russian billionaire Valery Kustov, executives of his Efko company and a government official responsible for drone development have all been detained in a major fraud investigation, multiple news outlets reported on Thursday.

Alla Polovchenya, who serves as deputy head of the Industry and Trade Ministry’s department of unmanned systems and robotics, was arrested and charged on Wednesday.