Apex domains cannot have CNAME records.
Question and response
Question
dig ASTRALINUX.RU. NS
Answer
astralinux.RU. 1 NS ns2.yandexcloud.net.
astralinux.RU. 1 NS ns1.yandexcloud.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0