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https://en.wikipedia.org/wiki/Igor_Sechin
https://www.theguardian.com/business/2006/aug/02/oilandpetrol.russia
https://www.vox.com/recode/22971179/russian-oligarchs-influence-putin-ukraine-war-sanctions-limits
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https://www.reuters.com/markets/europe/russian-billionaires-see-wealth-rise-over-half-trillion-dollars-forbes-2023-04-22/
https://www.reuters.com/world/europe/russian-billionaires-see-collective-wealth-near-600-bln-forbes-2024-04-02/
https://www.rferl.org/a/russia-300-millon/32032247.html
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https://www.chathamhouse.org/2023/10/putin-using-de-privatization-create-new-generation-loyal-oligarchs
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https://www.reuters.com/world/europe/russias-deripaska-under-fire-rare-anti-war-comments-2024-08-09/