Apex domains cannot have CNAME records.
Question and response
Question
dig grand-fair.ru. NS
Answer
grand-fair.ru. 5 NS dns1.yandex.net.
grand-fair.ru. 5 NS dns2.yandex.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0