Because he knows what he’s talking about.
Does Sachs really know what he is talking about (at least wrt Ukraine). Many Ukrainians disagree: https://braddelong.substack.com/i/123831395/open-letter-to-jeffrey-sachs-on-the-russia-ukraine-war
Re the leaked secret documents, here's another suspicious cover story reported in Naked Capitalism: https://www.nakedcapitalism.com/2023/04/larry-johnson-and-other-former-insiders-debunk-air-guardsman-as-pentagon-leaker-story-as-press-cheers-arrest.html
Does Sachs really know what he is talking about (at least wrt Ukraine). Many Ukrainians disagree: https://braddelong.substack.com/i/123831395/open-letter-to-jeffrey-sachs-on-the-russia-ukraine-war
Re the leaked secret documents, here's another suspicious cover story reported in Naked Capitalism: https://www.nakedcapitalism.com/2023/04/larry-johnson-and-other-former-insiders-debunk-air-guardsman-as-pentagon-leaker-story-as-press-cheers-arrest.html