Note that neither Putin nor Zelensky is listed as an alumnus.
Then there is this:
Why Does Klaus Schwab Think That Vladimir Putin Was a WEF Young Global Leader? "Apparently WEF “Young Global Leaders” must be 38 or under when they are admitted. At 38 Putin would have still been in the KGB in the dying days of the USSR in 1990. Also, WEF didn’t start the Young Global Leaders program (as “Global Leaders for Tomorrow”) until 1993 when Putin was already 41. I doubt Putin was a WEF Young Leader, I think Schwab misremembered. But I also think that Schwab wrongly remembering Putin being a young WEF hope is notable."