For anyone daft enough to suggest that Zelensky is the problem, I would encourage them to read these two books:
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Or if you are short of time, follow this link and have a look at the section 'Re-Emergence of the Russian Challenge', which summarises in 4 pages why it's Putin that is the ****. The book may already be 7 years old but Shekhovtsov's study is still relevant.
Just click on the 'Read Sample' option.
I can also recommend Killer in the Kremlin by John Sweeney and Nothing is True and Everything is Possible by Peter Pomerantsev.
The latter is an incredible, terrifying book.