The files "Vulnerabilities/Fetched Data.txt" appear to be output from an automated security scanner that targeted public-facing web servers. Some directory labels are inaccurate. For instance, a company listed as a crypto exchange—Cryptopro—is actually an IT consulting firm focused on cryptography and PKI.
A number of Word, Excel, and PDF files containing corporate reports and similar materials appear to be publicly accessible online and even indexed by search engines. I was able to locate several by searching their titles.
One file, "Part 1/Report those Russian ringleaders/russRingleadersPerDFUNAFO.txt", seems to be the likely source of the "Kremlin Assets in the West" mention. It’s a brief list of Twitter accounts and may have been assembled through open-source intelligence methods.
While the leak might contain some mistakenly published or sensitive material, I didn’t come across anything as significant or dramatic as implied by the article linked.