Apex domains cannot have CNAME records.
Question and response
Question
dig ARTEMOFF.RU. NS
Answer
artemoff.ru. 5 NS artemoff.ru.
Authority
The response has no authority records.
Additional
artemoff.ru. 5 A 188.164.136.145
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0