U17 European Championship exists, France won the second edition this year with the Hubert Henno's son for example. And there have been 13 editions of the U19 championships, the last one in 2018 : https://www.cev.eu/Competition-Area/History.aspx?ID=756

@Sherlock I only said that European Junior Championships should be in this site like U17 and U19 Championships. I didn't say anything about the non-existence of U17 and U19 championships. And I DO KNOW they exist. I pointed the issue because I do not know how to add European U20 and U21 tournaments to the site. That's all.

Oh sorry, my bad, I misunderstood !

Also, apart from the those U21 and U20 European Championships, Soviet Union Cup should also be added to the site.

For Men: https://ru.wikipedia.org/wiki/Кубок_СССР_по_волейболу_среди_мужчин

For Women: https://ru.wikipedia.org/wiki/Кубок_СССР_по_волейболу_среди_женщин

I can do it when I will have time. Do you have more precise rankings, with more than the first three teams ?

@Sherlock Unfortunately I don't. The first Soviet Cuo in 1950 is the only one that is given in detail in Wiki. If I find a more detailed source I'll let you know.