Password recovery on the hub to the mail.ru mailbox no longer belonging to me

I hope I have one password recovery for the mail.ru mailbox that doesn’t already belong to me, which also cannot be changed?

UPD: This is just a warning that it is possible that someone used (em) a non-primary email (for example, to mail.ru) to register on any sites.
Be careful. In the event that you lose control of this email, it is likely that you will also lose the account (s) registered to this email.