Apex domains cannot have CNAME records.
Question and response
Question
dig inetcom.ru. NS
Answer
inetcom.ru. 5 NS ns2.inetcom.ru.
inetcom.ru. 5 NS ns1.inetcom.ru.
Authority
The response has no authority records.
Additional
ns1.inetcom.ru. 5 A 194.187.205.239
ns2.inetcom.ru. 5 A 194.187.204.251
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0