YandexGPT

The policy does not say whether user content is used to train models.

“(b) to enhance, maintaining accessibility, modify, personalize or otherwise improve the Sites and Services for the benefit of all users; and”

“Unless otherwise legally required or agreed, the emails and documents, which are stored by you on our systems as part of the Service, will remain stored as long as you have an account with us, but you can delete them at any time.”

“For users in the EEA: Russia is a jurisdiction outside the European Economic Area, which has not been recognized by the European Commission as providing an adequate level of personal data protection. / In particular, Yandex relies upon Standard Contractual Clauses approved by the European Commission to ensure an adequate level of protection for your Personal information transferred to Russia.”