There's simple way to solve this. delete telegram and install end to end encrypted messenger. then you don't have to figure out what Russia or any other government might do, or if you can trust employees or management of the company.
https://juraj.bednar.io/en/blog-en/2022/04/29/encrypted-messengers-how-to-communicate-privately/
https://juraj.bednar.io/en/blog-en/2022/05/03/encrypted-messengers-comparison/