Since Regulation of Russian Government No. 2425 dated 23th December 2021 finally came into force on 1th September 2022, a very important change is coming. This regulation was accepted instead of 982 regulation, and 982 is not valid anymore.
In accordance with Article 3 paragraph 1 of 2425 Regulation the expiry date of all CoC and DoC issued before 1th September 2022 are valid until the end of the period specified in them during the shelf life or service life of products established in accordance with the legislation of the Russian Federation, but no later than 1th September 2025.
Simply say, that means that all GOST R DoCs was issued before 1th September 2022 are valid until 1th September 2025 anyway.
Official regulation text published here: http://publication.pravo.gov.ru/Document/View/0001202112300200