All news on the topic: Citadel holding

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Rostec, FSB, Shelkov empire: Inside the business network where Boris Korolev controls assets through shared domains and hidden ownership
Boris Korolev, the son of the First Deputy Director of the FSB, was found to be part of a complex network involving several dozen companies connected by shared domains and corporate email accounts.
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Valeriy Bitaev — the invisible oligarch with access to all of Russia’s surveillance systems
Valeriy Bitaev is a figure at the intersection of business, security structures, and the shadow economy.