ID

Yandex ID personal account allows you to work with your data. - https://passport.yandex.ru/profile/data
When logging in you will be sent a code by SMS to your phone, you will need to enter it.
That is, you can request the archive with the information accumulated about you by Yandex.
It will be necessary to wait some days, then they will inform.

There is an opportunity to delete selectively or completely your data.

The archive includes information from more than 50 services Yandex.
You can now delete data from Alice, Yandex.Music, Yandex.Mail, Yandex.Messenger, Yandex.Station, and other services.