They, Yandex, find some fake reason, while their AI run algorithms supposedly had noticed that your account had been compromised, etc... to Lock you out of your account when it is obvious that there was no hacking or other crap they claim as such reason to lock you out - for "the account owner's own good" of course and then they begin to demand your phone number and very private info, including passports, driving licences, photos of yourself etc, doesn't matter how well you can prove to them that it is you who is the owner, it will not work unless you give them all your intimate details, legal documents and photos that even your ex GF or BF is hardy aware of... yandex.com is aware of course of the fact that most people will use short names, nicknames, or just a temp e-mail name when they open accounts, so they would jump at you later on with the insane request, based on the fake "compromised account" claim by the "bad guys", so that you need now to send them a photo of yourself and your real documents, since, yeah: you guessed it: you have given them already your name... and they also use other tricks from the antique IT books, etc... so yeah, stay away from them, if you value your privacy, data, etc. they are some sort of legitimate fraudulent scammers running e-mail and search engine etc... business. If that description make sense!