Apex domains cannot have CNAME records.
Question and response
Question
dig my-ihor.ru. NS
Answer
my-ihor.ru. 5 NS ns2.ihordns.net.
my-ihor.ru. 5 NS ns1.ihordns.net.
Authority
The response has no authority records.
Additional
ns1.ihordns.net. 5 A 5.252.116.8
ns2.ihordns.net. 5 A 45.89.64.5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0